Zheng He's first voyage (1405-1407) began in July 1405. They set sail from Liujiagan Port in Taicang of Jiangsu Province and headed westward. The fleet had about 208 vessels total, including 62 Treasure Ships, and more than 27,800 crewman. They traveled to present day Vietnam.
Once America entered World War II after the bombing of Pearl Harbor, the federal government called on businesses all over the country to increase production of war materials (ammunition, guns, airplanes, etc.). This need for the aforementioned products caused businesses to seek new employees to hire. Considering that millions of men all over the country were drafted into the war, this resulted in women being persuaded to join the work force.
Since women joined the workforce and men were employed by the military, the unemployment rate drops dramatically during World War II. Since more people were employed, more American citizens were getting paid consistently. This helped to ensure that America finally escaped the Great Depression once and for all.