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In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
After notorious revolutionary leader Pancho Villa's raid on Columbus, New Mexico, General John Pershing and his 150,000 man cavalry set out to get Villa.
In the Philippines, Army Rangers liberated 513 prisoners of war three years after the Bataan Death March.
Engineered by William Barclay Parsons, the 21-mile, four-track route of the New York City Subway was the largest public works project in history.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
The story of the polio crusade pays tribute to a time when Americans banded together to conquer a terrible disease.
A brilliant scientist, Oppenheimer was tasked with the development of the atomic bomb during World War II.
The contradictory history of a dam that became a statement of American power and prestige.