It began as a territorial dispute that grew into a war between two neighboring countries. By its end, the borders, and ultimately the destinies, of both nations changed forever. After 16 months of fierce fighting, the United States gained almost half of Mexico’s land – the present day Southwest from Texas to California. The newly acquired land made the United States a formidable transcontinental power and heralded the youthful republic’s coming-of-age. This series, which marks the 150th anniversary of the U.S.- Mexican War, is the first comprehensive television documentary to examine this significant conflict – the impact of which is still being felt today.