Have you ever visited the 49th state? Do you live there? Share your photos, videos and stories.
In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
A nation comes of age
Equipment failure, human error and bad luck led to the country's worst nuclear accident in 1979.
The contradictory history of a dam that became a statement of American power and prestige.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
The tale of oil-seeking mavericks whose risk-taking, sweat and dreams changed an American industry.
The U.S. and the Soviet Union race to build the hydrogen bomb during the Cold War, thus beginning the nuclear arms race.
Accounting for America's most famous inventor and his role in America's future.