By the end of World War II, more than 19 million women were in the workforce and 350,000 women had served in the US Armed Forces.

With ever-growing orders for war materials combined with so many men overseas fighting the war, women were called upon to work in ways previously reserved only for men.

The war effort demanded developments in the field of science and technology, developments that forever changed life in America and made present-day technology possible.

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