how & when hitler lose ?

Hitler was born in Austria but moved to Germany later. He fought in the World War 1 on the German side, and was honoured for his bravery in the War. Upset by Germany's defeat in World War 1, Hitler went into politics and joined the Nazi Party. In 1921, he became the leader of the Party. He was discontented with the German government and started the Beer Hall Putsch in 1923. The pilot failed, and Hitler was jailed for 5 years. In 1933, Hitler became Chancellor of Germany, and President next year. Under his rule, Germany became a dictorial state, and peace in Europe was seriously threatened.
In World War 2, two Powers formed to attack against each other. Axis Power include Germany, Italy, Hungary, Rumania, Bulgaria, Finland and Japan etc.. Allied Powers include Britain, France, Soviet Union, Holland, Belgium, Greece, U.S., Canada, Mexico, Brazil, Argentina, Colombia, Panama, China, Mongolia, Saudi Arabia, Lebanon, Iran, Iraq, Turkey, South Africa, Ethiopia, Egypt, Liberia, Australia and New Zealand etc..
There are battlefields in Europe and Asia. After the Pearl Harbour attack, the U.S. joined the War on the side of the Allies. This was a turning point in World War 2. In September 1943, the Allies landed at Italy. Italy Surrendered. In August 1944, the allies took place Paris. In May 1945, the Allies attacked Berlin from east and west. Germany surrendered. In 6 and 9 August 1945, the U.S. dropped an atombic bomb on two cities in Japan. In 15 August 1945, Japan declared unconditional surrender. The Second World War ended.