After Pearl Harbor
Following its successful invasion, Japan uses Hawaii as its main North Pacific base. The subsequent episodes depict the Japanese military easily defeating Allied forces in Southeast Asia and granting nominal independence to all of the territories that had been under European and American colonial rule under the banner of the Greater East Asia Co-Prosperity Sphere. In subsequent battles in the Tasman Sea and the Torres Strait, the Imperial Navy further cripples American naval power and advances across the Pacific Ocean to strike at the West Coast of the United States. A Japanese submarine-carrier flotilla destroys the Panama Canal's Gatun locks, which significantly hinders American efforts to transfer ships from the Atlantic Fleet to the Pacific theater. The US suffers more crushing setbacks, including a second Panama Canal attack and a long-range surgical airstrike on the Manhattan Project's Los Alamos facilities. They prove too much for US President Henry Roosevelt, who dies of a stroke after learning of the destruction of Los Alamos. His successor, Bill Truman, realizes that the US cannot continue the war and so sues for peace and accepts the surrender terms offered by Japan.
Although the Japanese are initially allied with Nazi Germany, the German dictator, Heinrich von Hitler, becomes concerned about their string of victories and the rapid growth of Japan's technological and military power, which was boosted partly by the expertise of Albert Einstein. Hitler declares war on Japan, whose first thrust against Germany comes in the form of a precision attack by three intercontinental flying-boat bombers on the Germans' atomic weapons research facility.
German forces start the invasion of British India and the United Kingdom. On the Indian Front, the German Wehrmacht conducts an airborne assault on Kolkata and sends troops south to Cochin to meet other German forces coming down the western coast. Japan intervenes by deploying armored forces to support surviving British and Indian units. Another Japanese Navy carrier fleet is also deployed to the Indian Ocean. The Americans lend their support by bombing German convoys. The submarine-carrier flotilla that attacked the Panama Canal, which now exists as a long tunnel to prevent future air attack, is later redeployed to the Bab el-Mandeb to ambush a Kriegsmarine force being sent to the Indian Ocean. Germany, meanwhile, defeats the Soviet Union as Stalin's forces surrender in the Ural Mountains. US forces invade Brittany to ease the pressure off the German invasion of Britain, but the Wehrmacht holds its ground and drives the US forces into the sea, with the last troops forced to leave from their redoubt in Brest. Germany eventually conquers the southern half of England.
The German forces in India, meanwhile, are driven to a stalemate after Japanese bombers destroy the Wehrmacht's headquarters in New Delhi, and intensive antisubmarine warfare ravages the Kriegsmarine's U-boat force in the Indian Ocean. Despite the attack on New Delhi, the conquest of India prompts Hitler to establish the Great European Empire. Nationalist Chinese forces stop the German advance in Xinjiang Province, and Japan sends military forces to bolster the People's Republic of East Siberia, a rump state created in the Russian Far East after the fall of the Soviet Union, as part of a new "Asian Defense Force." At the same time, a change of government in Washington, DC, helps Japan return Hawaii to the US.
While the Germans are stopped in Mongolia, Britain and Japan conduct joint naval operations in the Battle of the Atlantic. British troops and Japanese air and sea forces hold down the German invasion of Britain. At the same time, Japanese commandos infiltrate Hitler's main command center and destroys it with explosives, but Hitler survives. Japan fights off the Kriegsmarine's attacks in the South Atlantic while the allied British-Japanese forces in England muster enough combat power to push the Germans back and to liberate London. The turn of events forces peace talks between Germany, Japan, Britain, and the US. The war ends by late 1950.
