Oklahoma summary

Louisiana Purchase, western half of the Mississippi River basin purchased in 1803 from France by the United States; at less than three cents per acre for 828,000 square miles (2,144,520 square km), it was the greatest land bargain in U.S. history. The purchase doubled the size of the United States,

Oklahoma City, city, Canadian, Cleveland, and Oklahoma counties, capital of Oklahoma state, U.S., and seat (1907) of Oklahoma county. It lies along the North Canadian River near the centre of the state, about 100 miles (160 km) southwest of Tulsa. The city site, at an elevation of about 1,200 feet

United States, country in North America, a federal republic of 50 states. Besides the 48 conterminous states that occupy the middle latitudes of the continent, the United States includes the state of Alaska, at the northwestern extreme of North America, and the island state of Hawaii, in the