Find out about the ancient roots and modern history of Mother's Day, which is celebrated on the second Sunday in May in the United States.

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Sandra Day O'Connor, who became the first woman on the U.S. Supreme Court when she was appointed by President Ronald Reagan in 1981, speaks about her views on holy matrimony.

As World War II raged in Europe and North Africa, the United States celebrated its Independence Day in July 1941. It was looking increasingly likely that the U.S. would enter the war, and President Franklin Roosevelt delivered an address that equivocated America's own struggle for freedom in the 1700s with the struggle faced by her allies overseas.

Learn the facts and figures behind the many contributions of America's armed forces throughout the country's history.

HISTORY salutes the American soldier.

Father Emil Kapaun gave his life during the Korean War, but his selfless faith saved and inspired his fellow soldiers. President Obama recognized the Army chaplain with the Medal of Honor in 2013.

Take a look at the holiday marking the official beginning of summer and America's most solemn occasion.