Category: History
Question: The last "ancient" time period of this nation is named after the burial mounds, or kofun, of that time period. The Gempei War ended the Heian period of this country. Francis Xavier, a Jesuit missionary, and Commodore Matthew Perry came to this country during the Tokugawa Shogunate. For 10 points, name this country formerly ruled by Emperor Hirohito where two atomic bombs were dropped.
Answer: Japan [or Nippon]

Japan is an island country in East Asia. It is in the northwest Pacific Ocean and is bordered on the west by the Sea of Japan, extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans an archipelago of 14,125 islands, with the four main islands being Hokkaido, Honshu (the "mainland"), Shikoku, and Kyushu. Tokyo is the country's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto.
The Japanese archipelago has been inhabited since the Upper Paleolithic (30,000 BC). Between the fourth and ninth centuries AD, the kingdoms of the region became unified under an emperor and the imperial court based in Heian-kyō. Beginning in the 12th century, political power was held by a series of military dictators (shōgun) and feudal lords (daimyō), and enforced by a class of warrior nobility (samurai). After a century-long period of civil war, the country was reunified in 1603 under the Tokugawa shogunate, which enacted an isolationist foreign policy. In 1854, a United States fleet forced Japan to open trade to the West, which led to the end of the shogunate and the restoration of imperial power in 1868. In the Meiji period, the Empire of Japan adopted a Western-modeled constitution, and pursued a program of industrialization and modernization. Amidst a rise in militarism and overseas colonization, Japan invaded China in 1937 and entered World War II as an Axis power in 1941. After suffering defeat in the Pacific War and two atomic bombings, Japan surrendered in 1945 and came under a seven-year Allied occupation, during which it adopted a new constitution.
Under the 1947 constitution, Japan has maintained a constitutional monarchy with a bicameral legislature, the National Diet. Japan is a highly developed country and a great power, with one of the largest economies by nominal GDP. Japan has renounced its right to declare war, though it maintains a self-defense force that ranks as one of the world's strongest militaries. A global leader in the automotive, robotics, and electronics industries, the country has made significant contributions to science and technology, and is one of the world's largest exporters and importers. It is part of multiple major international and intergovernmental institutions. Japan has over 125 million inhabitants and is the 11th most populous country in the world, as well as one of the most densely populated. About three-fourths of the country's terrain is mountainous, concentrating its highly urbanized population on narrow coastal plains. Japan is divided into 47 administrative prefectures and eight traditional regions. The Greater Tokyo Area is the most populous metropolitan area in the world. Japan has one of the world's longest life expectancies but is experiencing a population decline due to its very low birth rate.
Japan is a cultural superpower as its culture is well known around the world, including its art, cuisine, film, music, and popular culture, which encompasses prominent manga, anime, and video game industries.