land area of US today

3.8 million square miles (about 9.8 million square kilometers)

827,000 square miles

What was the land area of America in 1785 ?

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In 1785, the land area of the United States was approximately 827,000 square miles (about 2.14 million square kilometers). 

This measurement includes the land area of the original thirteen colonies along the eastern seaboard, as well as some of the western territories that had been acquired through treaties and colonial expansion. Keep in mind that the territorial boundaries of the United States have changed significantly since then due to acquisitions, treaties, and westward expansion.