Answer:
Almost every significant political figure of the American Revolution served in the Continental Congress, including Samuel Adams, John Adams, John Hancock, John Jay, Alexander Hamilton, Thomas Jefferson, Benjamin Franklin, James Madison, Patrick Henry and George Washington.
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WWl
More than 350,000 African Americans served in segregated units during World War I, mostly as support troops. Several units saw action alongside French soldiers fighting against the Germans, and 171 African Americans were awarded the French Legion of Honor.
WWII
Despite a high enlistment rate in the U.S. Army, African Americans were not treated equally. At parades, church services, in transportation and canteens the races were kept separate. A quota of only 48 nurses was set for African-American women, and the women were segregated from white nurses and white soldiers for much of the war. Eventually more black nurses enlisted. They were assigned to care for black soldiers. Black nurses were integrated into everyday life with their white colleagues. The first African-American woman sworn into the Navy Nurse Corps was Phyllis Mae Dailey, a Columbia University student from New York. She was the first of only four African-American women to serve as a Navy nurse during World War II.
Generally speaking, industrialization greatly reduced social inequality by creating a "middle class" of people, who were able to significantly increase their incomes due to the large number of jobs available in factories.