The area of the United States is about 3.8 million square miles. The country increased its size through several historical events:
1783 Treaty Ending the Revolutionary War (~890,000 square miles)
1803 Louisiana Purchase (President Jefferson ~820,000 square miles)
1845 Texas Annexation (Presidents Tyler and Polk - ~390,000 square miles)
1846 Oregon Treaty (President Polk - ~285,000 square miles)
1848 Mexican Cession (President Polk - ~530,000 square miles)
1867 Alaska Purchase (President Johnson - ~585,000 square miles)
Three of those events occurred under President James Polk, totaling over 1.1 million square miles.
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