The eastern half of the Roman Empire continued to exist as the Byzantine Empire for hundreds of years after the fall of the western half.
England, France, The United States, and Russia.
Milestones: 1830–1860.Gadsden Purchase, 1853–1854. The Gadsden Purchase, or Treaty, was an agreement between the United States and Mexico, finalized in 1854, in which the United States agreed to pay Mexico $10 million for a 29,670 square mile portion of Mexico that later became part of Arizona and New Mexico.
