The Onin War led to serious political fragmentation and obliteration of domains: a great struggle for land and power ensued among bushi chieftains until the mid-sixteenth century. Peasants rose against their landlords and samurai against their overlords as central control virtually ceased. The imperial house was left impoverished, and the bakufu was controlled by contending chieftains in Kyoto. The provincial domains that emerged after the Onin War were smaller and easier to control. Many new small daimyo arose from among the samurai who had overthrown their great overlords. Border defenses were improved, and wellfortified castle towns were built to protect the newly opened domains, for which land surveys were made, roads built, and mines opened. New house laws provided practical means of administration, stressing duties and rules of behavior. Emphasis was put on success in war, estate management, and finance. Threatening alliances were guarded against through strict marriage rules. Aristocratic society was overwhelmingly military in character. The rest of society was controlled in a system of vassalage. The shoen were obliterated, and court nobles and absentee landlords were dispossessed. The new daimyo directly controlled the land, keeping the peasantry in permanent serfdom in exchange for protection.

Most wars of the period were short and localized, although they occurred throughout Japan. By 1500 the entire country was engulfed in civil wars. Rather than disrupting the local economies, however, the frequent movement of armies stimulated the growth of transportation and communications, which in turn provided additional revenues from customs and tolls. To avoid such fees, commerce shifted to the central region, which no daimyo had been able to control, and to the Inland Sea. Economic developments and the desire to protect trade achievements brought about the establishment of merchant and artisan guilds.

By the end of the Muromachi period, the first Europeans had arrived. The Portuguese landed in southern Kyushu in 1543 and within two years were making regular port calls. The Spanish arrived in 1587, followed by the Dutch in 1609. The Japanese began to attempt studies of European civilization in depth, and new opportunities were presented for the economy, along with serious political challenges. European firearms, fabrics, glassware, clocks, tobacco, and other Western innovations were traded for Japanese gold and silver. Significant wealth was accumulated through trade, and lesser daimyo, especially in Kyushu, greatly increased their power. Provincial wars were made more deadly with the introduction of firearms, such as muskets and cannons, and greater use of infantry.

Christianity had an impact on Japan, largely through the efforts of the Jesuits, led first by Saint Francis Xavier (1506- 52), who arrived in Kagoshima in southern Kyushu in 1549. Both daimyo and merchants seeking better trade arrangements as well as peasants were among the converts. By 1560 Kyoto had become another major area of missionary activity in Japan. In 1568 the port of Nagasaki, in northwestern Kyushu, was established by a Christian daimyo and was turned over to Jesuit administration in 1579. By 1582 there were as many as 150,000 converts (2 percent of the population) and 200 churches. But bakufu tolerance for this alien influence diminished as the country became more unified and the openness of the period decreased. Proscriptions against Christianity began in 1587 and outright persecutions in 1597. Although foreign trade was still encouraged, it was closely regulated, and by 1640 the exclusion and suppression of Christianity had become national policy (see Tokugawa Period, 1600-1867 , this ch.; Religious and Philosophical Traditions , ch. 2).

Data as of January 1994