began sending weapons and support to the British, Chinese, and Soviets. Also, the U.S. placed an embargo against the Japanese, as they continued their war with China and conquered many colonies formerly ruled by the French and Dutch, who were now under German rule. In 1941, Japan launched a surprise attack on Pearl Harbor, an American naval base in Hawaii. The U.S. responded by declaring war on Japan. The next day, Germany and Italy declared war on the United States. The United States, the British Commonwealth, and the Soviet Union now constituted the Allies, dedicated to destroying the Axis Powers. Other allied nations included Canada, Australia, New Zealand, South Africa and China. In the Pacific War, British, Indian and Australian troops made a disorganised last stand at Singapore, before surrendering on 15 February 1942. The defeat was the worst in British military history. Around 15,000 Australian soldiers alone became prisoners of war. Allied prisoners died in their thousands interned at Changi Prison or working as slave labourers on such projects as the infamous Burma Railway and the Sandakan Death Marches. Australian cities and bases – notably Darwin suffered air raids and Sydney suffered naval attack. U.S. General Douglas MacArthur, based in Melbourne, Australia became "Supreme Allied Commander of the South West Pacific" and the foundations of the post war Australia-New Zealand-United States Alliance were laid. In May 1942, the Royal Australian Navy and U.S. Navy engaged the Japanese in the Battle of the Coral Sea and halted the Japanese fleet headed for Australian waters. The Battle of Midway in June effectively defeated the Japanese navy. In August 1942, Australian forces inflicted the first land defeat on advancing Japanese forces at the Battle of Milne Bay in the Australian Territory of New Guinea. By 1942, German and Italian armies ruled Norway, the Low Countries, France, the Balkans, Central Europe, part of Russia, and most of North Africa. Japan by this year ruled much of China, Southeast Asia, Indonesia, the Philippines, and many Pacific Islands. Life in these empires was cruel – especially in Germany, where the Holocaust was perpetrated. Eleven million people – six million of them Jews – were systematically murdered by the German Nazis by 1945. From 1943 on, the Allies gained the upper hand. American and British troops first liberated North Africa from the Germans and Italians. Next they invaded Italy, where Mussolini was deposed by the king