section_path: History/Course of the war/War breaks out in the Pacific (1941)
section_name: War breaks out in the Pacific (1941)
paragraph_text: War breaks out in the Pacific (1941)
  
  Following the Japanese false flag Mukden incident in 1931, the Japanese shelling of the American gunboat USS Panay in 1937, and the 1937–1938 Nanjing Massacre, Japanese-American relations deteriorated. In 1939, the United States notified Japan that it would not be extending its trade treaty and American public opinion opposing Japanese expansionism led to a series of economic sanctions—the Export Control Acts —which banned U.S. exports of chemicals, minerals and military parts to Japan, and increased economic pressure on the Japanese regime. During 1939 Japan launched its first attack against Changsha, but was repulsed by late September. Despite several offensives by both sides, by 1940 the war between China and Japan was at a stalemate. To increase pressure on China by blocking supply routes, and to better position Japanese forces in the event of a war with the Western powers, Japan invaded and occupied northern Indochina in September 1940.
  
  Chinese nationalist forces launched a large-scale counter-offensive in early 1940. In August, Chinese communists launched an offensive in Central China; in retaliation, Japan instituted harsh measures in occupied areas to reduce human and material resources for the communists. Continued antipathy between Chinese communist and nationalist forces culminated in armed clashes in January 1941, effectively ending their co-operation. In March, the Japanese 11th army attacked the headquarters of the Chinese 19th army but was repulsed during Battle of Shanggao. In September, Japan attempted to take the city of Changsha again and clashed with Chinese nationalist forces.
  
  German successes in Europe prompted Japan to increase pressure on European governments in Southeast Asia. The Dutch government agreed to provide Japan with oil supplies from the Dutch East Indies, but negotiations for additional access to their resources ended in failure in June 1941. In July 1941 Japan sent troops to southern Indochina, thus threatening British and Dutch possessions in the Far East. The United States, the United Kingdom, and other Western governments reacted to this move with a freeze on Japanese assets and a total oil embargo. At the same time, Japan was planning an invasion of the Soviet Far East, intending to take advantage of the German invasion in the west, but abandoned the operation after the sanctions.
  
  Since early 1941, the United States and Japan had been engaged in negotiations in an attempt to improve their strained relations and end the war in China. During these negotiations, Japan advanced a number of proposals which were dismissed by the Americans as inadequate. At the same time the United States, the United Kingdom, and the Netherlands engaged in secret discussions for the joint defence of their territories, in the event of a Japanese attack against any of them. Roosevelt reinforced the Philippines (an American protectorate scheduled for independence in 1946) and warned Japan that the United States would react to Japanese attacks against any "neighboring countries".
  
  Frustrated at the lack of progress and feeling the pinch of the American–British–Dutch sanctions, Japan prepared for war. Emperor Hirohito, after initial hesitation about Japan's chances of victory, began to favour Japan's entry into the war. As a result, Prime Minister Fumimaro Konoe resigned. Hirohito refused the recommendation to appoint Prince Naruhiko Higashikuni in his place, choosing War Minister Hideki Tojo instead. On 3 November, Nagano explained in detail the plan of the attack on Pearl Harbor to the Emperor. On 5 November, Hirohito approved in imperial conference the operations plan for the war. On 20 November, the new government presented an interim proposal as its final offer. It called for the end of American aid to China and for lifting the embargo on the supply of oil and other resources to Japan. In exchange, Japan promised not to launch any attacks in Southeast Asia and to withdraw its forces from southern Indochina. The American counter-proposal of 26 November required that Japan evacuate all of China without conditions and conclude non-aggression pacts with all Pacific powers. That meant Japan was essentially forced to choose between abandoning its ambitions in China, or seizing the natural resources it needed in the Dutch East Indies by force; the Japanese military did not consider the former an option, and many officers considered the oil embargo an unspoken declaration of war.
  
  Japan planned to seize European colonies in Asia to create a large defensive perimeter stretching into the Central Pacific. The Japanese would then be free to exploit the resources of Southeast Asia while exhausting the over-stretched Allies by fighting a defensive war. To prevent American intervention while securing the perimeter, it was further planned to neutralise the United States Pacific Fleet and the American military presence in the Philippines from the outset. On 7 December 1941 (8 December in Asian time zones), Japan attacked British and American holdings with near-simultaneous offensives against Southeast Asia and the Central Pacific. These included an attack on the American fleets at Pearl Harbor and the Philippines, as well as invasions of Guam, Wake Island, Malaya, Thailand, and Hong Kong.
  
  These attacks led the United States, United Kingdom, China, Australia, and several other states to formally declare war on Japan, whereas the Soviet Union, being heavily involved in large-scale hostilities with European Axis countries, maintained its neutrality agreement with Japan. Germany, followed by the other Axis states, declared war on the United States in solidarity with Japan, citing as justification the American attacks on German war vessels that had been ordered by Roosevelt.