World War II, or the Second World War, was a global war that was under way by 1939 and ended in 1945. It involved a vast majority of the world's nations, including all of the great powers, eventually forming two opposing military alliances: the Allies and the Axis.
Various advanced weapons were made during the war, and the Axis conquered many countries in Europe, Africa, and Asia.
The Allied response was the creation of the first super soldier, Captain America, who became a symbol of freedom and justice.
The war became much more complicated when the Nazi SS general Johann Schmidt separated his HYDRA division from his Nazi backers to start his own global conquest.
The war ended with the complete victory for the Allies, who defeated both the Axis and HYDRA.