Days after Pearl Harbor, Nazi Germany declared war on America. But why did Hitler choose to draw the United States directly into the European conflict?

From Franklin D. Roosevelt’s perspective in the White House, democracy was under attack overseas and at home in mid-1941.

America's isolation from war ended on December 7, 1941, when Japan staged a surprise attack on American military installations in the Pacific. 

The 442nd Regimental Combat Team, a segregated Japanese American unit, is remembered today for its brave actions in World War II. Despite the odds, the 442nd’s actions distinguished them as the most decorated unit for its size and length of service in the history of the US military.

World War II was a global conflict involving nearly every country in the world. But who was on each side—and why?