Often called America's "original sin," slavery is arguably the greatest stain on the nation's history. Unfree African and African-American laborers contributed to the growth and development of the cou
Over the last 60 years, environmental politics and policy have shaped the modern world and sparked some of the most controversial and complicated disputes in American history. On issues from toxic che
From the American Revolution in the 18th century to the Iraq War in the 21st century, wars have had a profound impact on U.S. history. Each of the 12 major conflicts since 1775 has generated impassion
