The United States formally enters World War II after the attack on Pearl Harbor, setting the stage for the development of super soldiers.
During WWII, various countries pursued enhanced soldier programs, including experimental research, although none matched the fictional super soldier serum.
The end of World War II leads to significant geopolitical changes and the start of the Cold War era, impacting global military and scientific developments.
The movie Captain America: The First Avenger is released, bringing to life a fictionalized version of WWII events intertwined with superhero mythology.