Why Was Unifying Japan Not Enough?

A week after Toyotomi Hideyoshi died in 1598, five senior officials sent a letter announcing that his health was improving.

The recipient, Nabeshima Naoshige, was commanding troops in Korea. The letter sought to reassure him. Hideyoshi's death was being concealed while the leadership arranged to withdraw the Japanese forces. The document survives: five men writing together to keep a dangerous situation manageable after the man at the center of their government was gone.^[1]

It is an unsettling place to begin a story about unification. Hideyoshi had overcome rival lords and established supremacy over Japan's competing centers of power. He had also launched the invasions of Korea that left armies overseas when he died. His commanders still needed orders, provisions, and a way home.^[2]

The letter does not show a government that had instantly ceased to function. On the contrary, officials could still cooperate. What remained uncertain was whether cooperation around an immediate problem would become a lasting agreement about who should rule.

Why did Hideyoshi's family fail to retain the position he had won, while the Tokugawa order that followed endured for more than two centuries?

The answer requires looking past the founder's personality. It begins with the difference between making people submit and giving their successors continuing reasons—and obligations—to live within the same settlement.

Hideyoshi left a young son, Hideyori. Arrangements for the succession involved leading territorial lords, conventionally called the Five Elders, and senior administrators known as the Five Commissioners. Tokugawa Ieyasu stood among the former; Ishida Mitsunari among the latter.^[3]

These were not interchangeable officials whose power came entirely from sitting at a council table. The great lords commanded territories and retainers of their own. The administrators possessed different combinations of authority, experience, and connections. Their positions within Hideyoshi's government brought them together without making their interests identical.

This was the strength and the difficulty of the arrangement. A child could not personally command all the forces required to protect his inheritance. He needed adults powerful enough to maintain the order around him. Yet those same adults possessed the capacity to disagree about its direction.

An oath could express an obligation. It could not prevent every future dispute over what that obligation required.

Nor did loyalty to Hideyoshi necessarily answer the most urgent question after his death: whose instructions should prevail when people who had served him issued conflicting demands? Several sides might claim that they were defending the proper settlement. Agreement about the founder's importance could coexist with a struggle over his legacy.

It would be too easy to conclude that Hideyoshi should simply have found more loyal men. That explanation assumes the very thing that needs explaining: how personal fidelity was to become cooperation among people with independent resources after the person they had served could no longer arbitrate.

The surviving letter gives the problem a precise form. The officials could act together to bring troops home. Doing so did not settle every relationship among them, the great lords, and the heir. An institution can perform one important task successfully while its larger political future remains open.

Hideyoshi had nevertheless built more than a collection of personal loyalties.

A land-survey register from a village in Ōmi, near Lake Biwa, dates to 1584. Among the officials named in its closing entry is Ishida Sakichi, the man better known as Ishida Mitsunari.^[4] The future participant in the struggle at Sekigahara also appears in a record of land administration.

That is a useful change of perspective. A name remembered for losing a battle belonged to a person who had helped make the earlier regime govern.

The surveys associated with Hideyoshi measured holdings and assessed productive capacity. Expressing land in a more comparable fiscal language helped rulers judge revenues and the obligations they could place on territorial lords. Implementation was uneven: some figures came through lords' reports, and an assessed yield was not the same thing as an actual year's harvest.^[5]

Even an imperfect assessment could change a political relationship. A ruler who could compare resources had a firmer basis for assigning demands than one who knew only a lord's professions of loyalty. A territorial reward could also be understood in terms of the income it was expected to support.

For the cultivator, the same process looked different. Recording a field made it more usable as evidence in decisions about revenue and obligation. The information that strengthened government also strengthened its ability to make claims on people's work.

This is why it is misleading to contrast a purely personal Toyotomi regime with an institutional Tokugawa one. Land administration and other arrangements developed under Nobunaga and Hideyoshi became important parts of the later order. Historian John Whitney Hall places the origins of many Tokugawa institutions before the Tokugawa shogunate itself.^[6]

The distinction we need is subtler. A founder can build institutions that last without ensuring that his own descendants will control them. Administrative success and dynastic survival are related achievements, not the same achievement.

Hideyoshi's 1588 sword-collection edict makes the social terms of his settlement unusually clear.

It prohibited farmers from possessing weapons, connected armed resistance with difficulties in collecting dues, and directed the authorities to confiscate the weapons. It also promised that the collected metal would serve a great Buddha project and presented exclusive devotion to farming as a route to prosperity.^[7]

Security, revenue, social discipline, and religious merit appeared in the same order. The promise was that people would flourish by remaining within the occupations and obligations assigned to them.

An edict is evidence of what a government demanded, not proof that every village immediately complied. Its language nonetheless tells us something essential about the kind of peace being pursued. Ending a lord's private war and restricting a farmer's capacity for armed resistance could belong to the same program of consolidation. They did not have identical consequences for the people affected.

There is a second limit to the word “peace.” Hideyoshi's campaigns in Japan were followed by invasions of Korea in 1592 and 1597, bringing Japanese forces into a devastating war against Korean and Ming Chinese resistance.^[2]

Domestic supremacy had increased his ability to mobilize resources. It had not made the use of those resources peaceful beyond Japan's shores.

We should therefore distinguish three questions often folded into one. Had a ruler suppressed competing claims to supremacy? Could his family retain its position? Were people safer from violence? A favorable answer to the first did not guarantee favorable answers to the other two.

The letter sent after Hideyoshi's death belongs to this larger world. The officials were not merely arranging a funeral and the upbringing of an heir. They were managing the consequences of a war that the founder's authority had helped make possible.

A powerful state can create problems of a scale that a weaker one could never have attempted. Capacity is not itself a judgment about the ends it serves.

The battle fought at Sekigahara in 1600 is often remembered as a straightforward contest between the Toyotomi and the Tokugawa. The careers of the participants make that division less tidy.

Fukushima Masanori had risen in Hideyoshi's service. At Sekigahara, he fought for Ieyasu against the coalition associated with Mitsunari. Hiroshima Castle's account of his career notes that afterward he could serve Ieyasu while still sometimes acting as a Toyotomi retainer. The Toyotomi family's destruction in 1615 finally ended that overlap.^[8]

Serving the old founder and supporting his most powerful former subordinate had not always been experienced as a choice between mutually exclusive worlds.

This matters because a durable new regime does not necessarily begin by replacing everyone connected with the old one. It may grow by redirecting existing abilities, ambitions, and obligations. People who had helped create one political order could become indispensable to the next.

After Sekigahara, Ieyasu awarded Fukushima former Mōri territories centered on Hiroshima. The transfer was followed by practical work on the ground, including a survey in 1601 and the allocation of holdings to retainers.^[9]

A battlefield result was becoming a geography of income and responsibility.

The change did not transport empty land from one owner to another. Villages, towns, officials, and former retainers were already there. An incoming lord needed ways to turn a grant into revenue and effective administration. The award created an opportunity; it did not collect the next harvest.

It also gave the beneficiary a new stake. The continuing value of his reward depended partly on the authority that recognized it. At the same time, he retained resources that made him a participant to be managed, not merely a grateful name on a list.

Fukushima's later fate would expose the other side of that relationship. A government able to grant a major territory would also seek the power to withdraw it.

Ieyasu received the title of shogun in 1603. Two years later, he passed it to his adult son Hidetada. Ieyasu remained influential, but a second Tokugawa already held the office before the founder died in 1616.^[10][11]

The arrangement did more than announce an intention about the future. It placed a successor in an operating political role while his father was still present to support the transition.

That does not mean Hidetada immediately made every important decision independently. The overlap is the point. Succession could be something people practiced through business, audiences, and commands before it became a crisis prompted by a death.

Compare the problem facing Hideyori. It was not simply that one son was cleverer than another. Age, available time, and the distribution of power were different. An adult already occupying an office could accumulate recognition through its use; a child required others to act for him. Neither arrangement was risk-free, but their risks were not the same.

One event makes Hidetada's active position particularly clear. In 1615, the Laws for the Military Houses were promulgated under his authority to assembled lords at Fushimi. The text was drafted by the monk Ishin Sūden and formed part of the developing framework for governing the warrior elite.^[12]

The law was not simply Ieyasu's wisdom preserved for use after his death. Its issue involved a successor, advisers, a text, and an audience expected to heed it. A ruling house was establishing ways for authority to operate through more than the continued personal presence of its founder.

This is one reason to resist turning Tokugawa longevity into a story about Ieyasu's patience alone. Patience may help someone survive. It cannot by itself provide the people and procedures through which someone else will govern next.

There was still an exceptional household at Osaka.

Hideyori had not disappeared when Ieyasu became shogun. In 1603, he married Senhime, Hidetada's daughter and Ieyasu's granddaughter. In 1611, Hideyori met Ieyasu at Nijō Castle in Kyoto.^[10][13]

Marriage and a ceremonial meeting did not erase the unequal balance of forces. They did show that the relationship continued to be handled through arrangements other than immediate war.

Seen afterward, Osaka's destruction can make every earlier encounter look like a step in a plan whose ending was already certain. That is not a safe way to read the evidence. Negotiation may be sincere, tactical, fragile, or several of these at once. Its eventual failure does not tell us that no alternative was ever being considered.

The structural difficulty was that the Toyotomi possessed more than an ordinary lord's past. Hideyori was the heir of the previous ruler. His house's continued standing raised a question about what place it should have within a Tokugawa-led order.

The campaigns of 1614–15 resolved that question by destroying the household as an independent political power.^[14] They did not resolve it by producing a settlement that both sides could continue to inhabit.

It is possible to explain why eliminating a rival strengthened the victors without presenting elimination as a moral necessity. The people who died did not become dispensable because a long period of relative domestic peace followed. Nor does later stability prove that every step toward it was the only available course.

Osaka marks the coercive edge of the emerging order. Some former rivals could be incorporated and given a stake. Another center of authority was destroyed. The difference was not produced by the word “unification”; it was produced by choices, conflicts, and a balance of forces that had changed over time.

The laws of 1615 did not order the great lords to forget warfare. They began by requiring the cultivation of both literary and military skills. They also prohibited unauthorized new castles, required notification of repairs, and restricted marriages undertaken without approval.^[15]

The combination is revealing. The shogunate wanted a warrior elite capable of service, but less able to turn its resources into independent military coalitions.

A castle was a place from which resistance could be organized. A marriage could connect two powerful houses. Regulating these matters reached beyond ceremonial deference into the means by which lords could increase their strength.

Fukushima Masanori learned how consequential those restrictions could be. After a flood damaged Hiroshima Castle in 1617, repairs were undertaken without the required prior notification. A dispute over the work and the conditions imposed afterward ended in the confiscation of his major holdings in 1619. His retainers initially held the castles, then handed them over on his instructions.^[9]

The man rewarded after Sekigahara had discovered that past service did not place his territory permanently beyond review.

This was not modern equality before an impersonal law. The shogunate possessed considerable discretion, and negotiations over punishment formed part of the process. But the episode illustrates a developing claim: a lord's control of his castle was subject to obligations enforceable by an authority above him.

That arrangement depended on more than frightening one offender. The castle had to be transferred, its garrison had to respond, and another household had to govern. The succeeding Asano regime retained many fiscal and local administrative arrangements developed under the Fukushima.^[8]

Removal of a lord did not require the destruction of every means by which his lands were administered. The distinction made the larger order less dependent on any single participant remaining in favor.

At the same time, local government still relied on powerful houses. The shogunate had not replaced all of them with officers sent from Edo. It was building authority over other authorities, using their capacity to govern while constraining their capacity to defy it.

The system did not arrive complete in 1603, or even in 1615. Hall traces its stabilization into the decades of the third shogun, Iemitsu, while the historian Morgan Pitelka emphasizes the successive work of Hidetada and Iemitsu in overcoming obstacles that remained after Ieyasu's rise.^[6][16]

This changes what counts as an explanation. We should be looking for a sequence of arrangements that reinforced one another, not a single inspired design hidden in the founder's mind.

Land assessments made resources more usable in government. Grants gave some participants a stake in the settlement. A practiced succession allowed authority to acquire another face before the first disappeared. Rules and their enforcement constrained the independent use of castles, alliances, and armed strength. Local arrangements enabled much ordinary government to continue even when a lord was replaced.

None of these devices was sufficient alone. A grant could enrich a future opponent. A rule could be ignored. A successor could lose support. A violent victory could leave new grievances. Their effectiveness depended on how they worked together and on the repeated decisions of people who had not designed the whole.

The resulting stability was real, but it was not the same as equal freedom or the end of coercion. An order could reduce war among the great lords while preserving unequal obligations and using force against those who challenged it. Its durability and its justice remain different questions.

There is also no clean division between a failed founder and a successful founder. Hideyoshi's family lost its supremacy, yet parts of the administrative world created under him continued. Ieyasu's family retained power through work that did not end with Ieyasu. Historical achievement can survive in institutions whose later owners the original maker would not have chosen.

Return to the letter announcing that the dead Hideyoshi was recovering. Its reassurance concealed a death; its five signatures revealed a capacity to act without him. What those signatures could not guarantee was that the men and houses around them would agree on the next distribution of power.

That was the problem a lasting order had to address. It needed more than a winner powerful enough to obtain obedience once. It needed ways for governing to continue when the winner was absent, for participants to understand what they could expect, and for disputes to be contained without reopening the whole contest each time.

Unification could end one struggle over supremacy. What happened afterward determined whether the next generation would have to fight it again.