77.1% chance that the answer is making friends with foreign countries.
1851: Congress creates reservations to manage Native peoples. The U.S. Congress passes the Indian Appropriations Act, creating the reservation system. The government forces Native peoples to move to and live on reservations, where it can better subdue them.
After spending the winter in Vinland, Leif sailed back to Greenland, and never returned to North American shores. He is generally believed to be the first
