The census of 1800 showed that more than 5,000,000 people then dwelt in our country; of these, nearly 400,000 were in the five Western states and territories--Kentucky, Tennessee, Northwest, Indiana, Mississippi. PUBLIC LAND ON CREDIT.--The same year (1800) in which Congress created the territory of Indiana, it changed the manner of selling the public lands. Hitherto the buyer had been obliged to pay cash. After 1800 he might buy on credit, paying one quarter annually. The effect of this was to bring settlers into the West in such numbers that the state of Ohio was admitted in 1803, and the territory of Michigan formed in 1805. [8] [Illustration: SETTLED AREA IN 1810.] FRANCE ACQUIRES LOUISIANA.--For yet another reason the year 1800 is a memorable one in our history. When the French Minister of Foreign Affairs heard that Spain (in 1795) had agreed that 31° north latitude should be the dividing line between us and West Florida, he became alarmed. He feared that our next step would be to acquire West Florida, and perhaps the country west of the Mississippi. To prevent this he asked Spain to give Louisiana back to France as France had given it to Spain in 1762 (see page 143); France would then occupy and hold it forever. Spain refused; but soon after Napoleon came into power the request was renewed in so tempting a form that Spain yielded, and by a secret treaty returned Louisiana to France in 1800. [Illustration: THE UNITED STATES, 1805.] THE MISSISSIPPI CLOSED TO OUR COMMERCE.--The treaty for a while was kept secret; but when it became known that Napoleon was about to send an army to take possession of Louisiana, a Spanish official at New Orleans took away the "right of deposit" at that city and so prevented our citizens from sending their produce out of the Mississippi River. This was a violation of the treaty with Spain, and the settlers in the valley from Pittsburg to Natchez demanded the instant seizure of New Orleans. Indeed, an attempt was made in Congress to authorize the formation of an army of fifty thousand men for this very purpose. [Illustration: THE CABILDO, CITY HALL OF NEW ORLEANS.] LOUISIANA PURCHASED, 1803.--But President Jefferson did not want war; instead, he obtained the consent of Congress to offer $2,000,000 for West Florida and New Orleans. Monroe was then sent to Paris to aid Livingston, our minister, in making the purchase, and much to their surprise Napoleon offered to sell all Louisiana. [9] After some hesitation the offer was accepted. The price was $15,000,000, of which $11,250,000 was paid to France and $3,750,000 to citizens of our country who had claims against France. [10]