<span>On December 7, 1941 Japan attacked the US Navy at Pearl Harbor in Hawaii. ... The US joined the Allies in World War II the next day. The attack at Pearl Harbor united the Americans with the goal of defeating the Axis powers, and especiallyJapan.</span>
During the Cold War the United States and the Soviet Union engaged a competition to see who had the best technology in space. The Space Race was considered important because it showed the world which country had the best science, technology, and economic system.