Narrow Road To The Deep North 40

But there were bitter seeds of dissent sown from Sekigahara- While most clans were content, some resented their dishonor or displacement or defeat. Three bore grudges that would have consequences two centuries later- the relocated Mōri clan, headed by Mōri Terumoto; the Shimazu, led by Shimazu Yoshihiro, virtually autonomous during its last days; and the Chōsokabe, ruled by Chōsokabe Morichika, sent into exile. The descendants of these three clans would ultimately collaborate to bring down the Tokugawa shogunate, ushering in the Meiji Restoration.
On March 24, 1603 Tokugawa Ieyasu received the title of shogun from Emperor Go-Yōzei. At 60 years old, he had outlasted all the other great men of his times: Nobunaga and Hideyoshi and Shingen and Kenshin and many other brave samurai. Ieyasu used his remaining years to consolidate his rule. In 1605 he abdicated his official position as shogun. Appointing his third son and heir, Tokugawa Hidetada, as his formal successor. 
He retired to supervise the building of a massive construction project, where the Imperial Palace stands today.  The costs of Edo, the largest castle in all of Japan, would be borne by all the other daimyô, while Ieyasu reaped the benefits. Even late in his life, he swam in the moat. You can't manage the Empire properly without economy, for if those at the top are extravagant, taxes mount up and the lower orders are embarrassed, not to speak of the effect it has on military finances. But a lot of people can't understand the meaning of the word thrift, and think it means only omitting to do what you ought to do.
In 1611, Ieyasu, at the head of 50,000 men, visited Kyoto to witness the coronation of Emperor Go-Mizunoo. Two years later he put the court daimyô under strict supervision, leaving them as mere ceremonial figureheads. 
While the Dutch had been given exclusive trading rights, there were signs that Ieyasu meant to close down the country to outside influences. In 1614, he signed the Christian Expulsion Edict, expelled all Christians and foreigners, and banned ‘Kirishitans’ from practicing their religion. 
The last remaining threat to Ieyasu's rule was Hideyori, Toyotomi Hideyoshi’s son and rightful heir, a young daimyô living in Osaka Castle. Ieyasu ordered him to leave the fortress, but he refused and summoned samurai. The Winter Siege of Osaka led to Tokugawa filling Osaka Castle's outer moats with sand, so his 155,000 troops could walk across to the Summer Siege of Osaka. In late 1615, Osaka Castle fell. Nearly all the defenders were killed, including Hideyori, his infant son, and his mother, Hideyoshi's widow.