Involvement in WWII.
After the Rape of Nanking, Tojo tried to create an alliance with Germany and Italy; Adolf Hitler and Benito Mussolini, and succeeded. The Axis Powers was created for World War II. Tojo was the one to give the final approval to invade the Allies, Tojo had authorized the attack on Pearl Harbor, and from there World War II had begun. Japan was able to get the British army to surrender in Singapore and get the American forces to withdraw from the Philippines. As a result of Japan's early victories Tojo had gained more power, but those victories didn't last.
After the island of Saipan fell, due to American forces, Japan's army began to fall. The emperor, Hirohito, believed Tojo had lost control, so Tojo was taken out of power, both prime and army minister. Some argued Tojo should be left in power to take responsibility of Japan's loss but he was still taken out of power. After Japan surrendered, Tojo was put on trial as a war criminal in November 1948. Tojo was found guilty and was hanged as punishment. He died on Decemeber 23, 1948.