"Added areas"

- Alaska (1867)
- Midway Islands (1867)
- Philippines (1898)
- Puerto Rico (1898)
- Guam (1898)
- Hawaii (1898)
- Cuba (1902)
- Panama (1903)

As America sought to grow, America also sought to protect its overseas territories, and, more importantly, its existing territories. By acquiring Alaska, the Alleutian Islands, Midway Island, Hawaii, Guam, and Samoa, the perimeter of America extended. This issue of national security as a root for imperialism was mentioned in Henry Cabot Lodge's "Our Blundering Foreign Policy."
The extensions were often based on violence and oppression. They saw themselves as only "helping" those who they took under their power. President Roosevelt thus stated this in his Annual Message to Congress of 1904, where he says, "All that this country desires is to see the neighboring countries stable, orderly, and prosperous." but de facto, they had the goals described in the "Major reasons for expansionism" article. With the addition of these areas to the American empire, the U.S. took on the self ordained title of "Rulers of the Western Hemisphere."