The document discusses the importance of U.S. control over the Mississippi River in the early 1800s and the Louisiana Purchase that doubled the size of the country. It summarizes how Thomas Jefferson sent representatives to buy New Orleans from France but ended up purchasing the entire Louisiana Territory for $15 million. The expeditions of Lewis and Clark and Zebulon Pike are also summarized, including their goals to map the new western lands and learn about indigenous nations, and key events and discoveries they made along their journeys.

1. Chapter 10.2
The Louisiana Purchase

2. Louisiana Purchase…Today

3. Guiding Questions………
Why was control of the
Mississippi River
important to the United
States?

4. Guiding Questions………
How did the United
States purchase
Louisiana?

5. Guiding Questions………
What were the results of
the explorations of Lewis
and Clark and of Zebulon
Pike?

6. Control of the Mississippi River
Farmers west of the
Appalachians shipped their
crops on the Mississippi to
New Orleans. From there,
ships carried the produce to
Atlantic ports.

7. Control of the Mississippi River
 Spain controlled New Orleans.
Sometimes they threatened to
close the port. In the Pinckney
Treaty of 1795, Spain agreed
to let Americans ship their
goods down the Mississippi to
New Orleans.

8. Control of the Mississippi River
In 1800 Spain gave
Louisiana back to
France. Napoleon wanted
to grow food in
Louisiana.

9. Control of the Mississippi River
Events in Haiti, a French
colony in the Caribbean,
ruined his plans. Enslaved
Africans in Haiti revolted
and declared their
independence.

10. Control of the Mississippi River
To gain control of
Louisiana, Jefferson
decided to buy
Louisiana.

11. The U.S. Buys Louisiana
Jefferson sent Robert
Livingston and James
Monroe to buy New
Orleans and West Florida
from Napoleon.

12. The U.S. Buys Louisiana
Livingston and Monroe met
with the French foreign
minister. After some time,
he asked them if they would
like to buy all of Louisiana.

13. The U.S. Buys Louisiana
Surprised, Livingston at
first offered $4 million.
Eventually, he and
Monroe agreed to $15
million.

14. The U.S. Buys Louisiana
 No one was sure the purchase was
constitutional. In the end,
Jefferson decided that he did have
the authority to buy Louisiana.
The Senate approved the treaty,
and the Louisiana Purchase went
into effect.

15. Expedition of Lewis & Clark

16. Vocabulary…….
 Expedition: a long journey of exploration.

17. QuickTimeª and a
decompressor
are needed to see this picture.

18. Purposes of the expedition
to map a route across
the Louisiana Purchase
to the Pacific Ocean

19. Purposes of the expedition:
to study the territory’s
geography—land,
climate, plants, and
animals

20. Purposes of the expedition:
to learn about the Indian
nations who lived there

21. The Journey…..
 Lewis and Clark left from St.
Louis and crossed the plains
by way of the Missouri River.
Sacagawea, a Shoshone
woman, and her husband
agreed to accompany the party
as translators.

22. The Journey…..
The Shoshones showed
Lewis and Clark the best
route over the Rockies.
Lewis and Clark crossed
the Continental Divide.

24. Vocabulary…..
Continental Divide, the
high mountain ridge that
separates river systems
flowing toward opposite
sides of the continent.

25. The Journey…..
The party built canoes and
floated down the
Columbia River to the
Pacific Ocean.
The return trip back to St.
Louis took another year.

26. The Expedition of Zebulon Pike

28. Purpose of the journey
to explore the upper
Mississippi River, the
Arkansas River, and parts
of present-day Colorado
and New Mexico.

29. The Journey….
From Colorado and New
Mexico, Pike entered
Spanish territory. Spanish
troops arrested Pike and his
men and took them into
Mexico.

30. The Journey….
The party was later
escorted through Texas
back to the United States.