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On December 7–8, 1941, Japanese forces carried out surprise attacks on Pearl Harbor, attacks on British forces in Malaya, Singapore, and Hong Kong and declared war, bringing the US and the UK into World War II in the Pacific.<br/><br/>

After the Soviet invasion of Manchuria and the atomic bombings of Hiroshima and Nagasaki in 1945, Japan agreed to an unconditional surrender on August 15. The war cost Japan and the rest of the Greater East Asia Co-Prosperity Sphere millions of lives and left much of the nation's industry and infrastructure destroyed.
The Russian Revolution is the collective term for a series of revolutions in Russia in 1917, which dismantled the Tsarist autocracy and led to the creation of the Russian SFSR.<br/><br/>

The Tsar was forced to abdicate and the old regime was replaced by a provisional government during the first revolution of February 1917 (March in the Gregorian calendar; the older Julian calendar was in use in Russia at the time).<br/><br/>

In the second revolution, during October, the Provisional Government was removed and replaced with a Bolshevik (Communist) government.
The Great Kantō earthquake (関東大震災 Kantō daishinsai) struck the Kantō Plain on the Japanese main island of Honshū at 11:58 in the morning on Saturday, September 1, 1923. Varied accounts indicate the duration of the earthquake was between four and 10 minutes. The 2011 Tōhoku earthquake later surpassed that record, at magnitude 9.0.<br/><br/>

The earthquake had a magnitude of 7.9 on the Moment magnitude scale (Mw), with its focus deep beneath Izu Ōshima Island in the Sagami Bay. The cause was a rupture of part of the convergent boundary where the Philippine Sea Plate is subducting beneath the Okhotsk Plate along the line of the Sagami Trough.<br/><br/>

This earthquake devastated Tokyo, the port city of Yokohama, and the surrounding prefectures of Chiba, Kanagawa, and Shizuoka, and caused widespread damage throughout the Kantō region. The power was so great in Kamakura, over 60 km (37 mi) from the epicenter, it moved the Great Buddha statue, which weighs about 93 short tons (84,000 kg), almost two feet.<br/><br/>

Estimated casualties totaled about 142,800 deaths, including about 40,000 who went missing and were presumed dead. The damage from this natural disaster was the greatest sustained by prewar Japan. In 1960, the government declared September 1, the anniversary of the quake, as an annual 'Disaster Prevention Day'.<br/><br/>

According to the Japanese conclusive report, 105,385 deaths were confirmed in the 1923 quake.