In the late 19th century, the United States acquired several territories as part of its imperialistic expansion. Notable territories gained during this period include:
- Guam - Acquired in 1898 as a result of the Spanish-American War.
- Puerto Rico - Also obtained in 1898 following the Spanish-American War.
- Samoa - The U.S. gained control over parts of the Samoan Islands through a treaty in 1899.
- The Philippines - Acquired in 1898 after the Spanish-American War, which marked a significant step in America's emergence as a colonial power.
These acquisitions marked a shift in U.S. foreign policy and expanded American influence in both the Caribbean and the Pacific regions.