DO NOW:
Create a two-tab foldable to show the cause
and effects of the Louisiana Purchase (use
p. 283 to help you)
Inside each tab:
Cause
Effect
List three causes
and three effects
DO NOW
Possible causes:
• US wants control of
port of New Orleans
• Jefferson feared
French empire in
North America would
interfere with trade
• France had little use
for Louisiana Territory
Possible effects:
• US gains all of
Louisiana Territory for
only $15 million
• US doubles in size
• Series of exploration
into new land
• More people begin to
move west
Review: Complete the flow chart
Spain
changed
their policy
to not allow
goods to
pass into or
out of New
Orleans
France
gains
control of
Louisiana
Territory
from Spain
United States
purchased
entire
Louisiana
Territory for
$15 million
Jefferson
negotiates
with France
to purchase
New Orleans
only for $10
million
United
States
doubles
in size
The Louisiana Purchase
Lesson Essential Question
How did the United States expand
in the early 1800’s?
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lecture notes appear on the following slides.
Conestoga wagon
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to replay the audio.
I. Western Territory
1. During the early 1800’s more and more
Americans moved west in search of land
and adventure. 
2. They loaded
their goods into
Conestoga
Wagons. 
3. Their two most
valued
possessions
were a rifle and
an ax.
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I. Western Territory
4. In 1800 the territory of the U.S. extended
only as far west as the Mississippi River.

5. The area to the west was known as the
Louisiana Territory and belonged to Spain

6. The Spanish allowed the Americans to
sail on the lower Mississippi and trade in
New Orleans
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B. The French Threat
1. In 1802 the Spanish suddenly refused to
allow American goods to move into or
past New Orleans. 
2. President Jefferson learned
that Spain had secretly
transferred the Louisiana
Territory to France. 
3. France’s leader, Napoleon
Bonaparte, had plans for
empires in Europe and the
Americas. 
4. Jefferson sent Robert
Livingston as ambassador
and authorized as much as
$10 million for the purchase
of New Orleans and West
Florida
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C. Revolt in Santo Domingo
1. Napoleon was forced to abandon his
plans for an American empire. 
2. In 1802 Napoleon sent
troops to the Caribbean
island of Santo Domingo
to crush a major revolt
against French rule. 
3. The leader of the revolt,
Toussaint-Louverture,
was captured, but the
French could not regain
control of the island.
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II. The Nation Expands
A. The French needed money to finance
Napoleon’s plans for war against Britain. 
B. French foreign minister Charles de
Talleyrand informed the American
diplomats that the whole Louisiana
Territory was for sale. 
C. After a few days of negotiation, the
parties agreed on a price of $15 million.
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D. Legality of the Purchase
1. Jefferson worried whether the
purchase was legal. 
a. The Constitution said nothing about
acquiring new territory. 
b. Jefferson decided the government’s
treaty-making powers allowed the
purchase of the new territory 
2. The Senate gave its approval in October
1803. 
3. With the signing of the treaty, the size of
the United States doubled.
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DO NOW: Answer true or false to
the following statements.
In 1802…
1. there were woolly mammoths roaming the West.
2. there was a tribe of blue-eyed Indians living in the West who
spoke Welsh, the language of people from Wales, a region on
the west coast of the island of Great Britain.
3. there was a river, or series of connecting rivers, starting at the
Mississippi, that crossed the western mountains and reached
the Pacific Ocean.
4. the Blue Ridge Mountains were taller than the Rocky
Mountains.
5. the West had many erupting volcanoes.
6. unicorns could be found in the West.
7. there were mountains in the West made of undissolved salt.
8. some beavers in the West were seven feet tall.
9. buffaloes were friendly and had slim waists.
10.Peruvian llamas roamed the West.
In 1802…
1. there were woolly mammoths roaming the West.
2. there was a tribe of blue-eyed Indians living in the West who spoke
Welsh, the language of people from Wales, a region on the west
coast of the island of Great Britain.
3. there was a river, or series of connecting rivers, starting at the
Mississippi, that crossed the western mountains and reached the
Pacific Ocean.
4. the Blue Ridge Mountains were taller than the Rocky Mountains.
5. the West had many erupting volcanoes.
6. unicorns could be found in the West.
7. there were mountains in the West made of undissolved salt.
8. some beavers in the West were seven feet tall.
9. buffaloes were friendly and had slim waists.
10. Peruvian llamas roamed the West.
If you answered “True” to any of the above questions, you are wrong…
but all of these were thought to be true prior to the Lewis and Clark
expedition.
III. Lewis and Clark
A. Jefferson persuaded Congress to
sponsor an expedition to explore the new
territory. 
B. Jefferson was particularly interested in
the expedition as a scientific venture. 
C. Congress was interested in commercial
possibilities and in sites for future forts. 
D. Jefferson chose his private secretary,
Meriwether Lewis, to head the
expedition.
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III. Lewis and Clark (cont.)
E. The expedition’s co-leader was William
Clark, a friend of Lewis from military
service. 
F. Their Crew 
1. expert river men 
2. gunsmiths 
3. carpenters 
4. scouts 
5. a cook 
6. 2 Native American/French interpreters 
7. African American named York 
8. Lewis’ pet dog
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III. Lewis and Clark (cont.)
G. The expedition left St. Louis in the
spring of 1804 and traveled up the
Missouri River. 
H. Lewis and Clark kept a
journal of their voyage,
making notes on what
they saw and did. 
I. Along their journey they
encountered Native
American groups
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A New Frontier
Lewis and Clark carefully mapped
their entire trip across the vast,
uncharted, Louisiana Territory. In
addition, both Lewis and Clark
packed their journals with
descriptions and sketches of all they
saw.
Many of the local animals and
plants were new to Lewis and Clark.
They collected and preserved
specimens such as a prairie dog,
jackrabbit, black-tailed deer,
pronghorn, and mountain sheep.
III. Lewis and Clark (cont.)
J. One young Shoshone women named
Sacagawea become their guide. 
K. After 18 months and nearly 4000 miles,
Lewis and Clark reached the Pacific
Ocean. 
L. The expedition collected valuable
information on people, plants, animals,
and the geography of the West. 
M. Most importantly it inspired people to
move Westward.
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Partner reading
In your green packets –
Partners on the left read the page about
Thomas Jefferson
Partners on the right read the page about
Sacagawea
Highlight important info from your reading
and share with your partner when done
Corresponding text appears on
pages 286-287 of the textbook.
Click the speaker to hear an excerpt from an
April 1805 entry in the journal of Meriwether
Lewis, as he prepares to leave Fort Mandan.
Corresponding text appears on
pages 286-287 of the textbook.
Corresponding text appears on
pages 286-287 of the textbook.
Corresponding text appears on
pages 286-287 of the textbook.
N. Pikes Expedition
1. Zebulon Pike led two
expeditions between
1805 -1807 
2. He traveled through the
upper Mississippi River
valley and into Colorado

3. He found “Grand Peak”
which was later called
“Pikes Peak”
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O. Federalists Plan to Secede
1. Many federalist opposed
the Louisiana Purchase 
2. A group of Federalist in
Massachusetts planned to
secede from the Union 
3. The plotters turned to
Aaron Burr who had been
cast aside by the
Republicans for his refusal
to withdraw from the 1800
election
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P. Burr and Hamilton
1. Alexander Hamilton had never trusted
Aaron Burr 
2. Hamilton accused Burr of plotting treason

3. When Burr lost his election he blamed
Hamilton and challenged him to a duel
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P. Burr and Hamilton
4. The two men met in July 1804, armed
with pistols 
a. Hamilton pledged not to shoot his rival

b. Burr aimed and fired at Hamilton 
c. Hamilton died the next day and Burr
fled to avoid arrest.
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Read the article “Burr
Slay’s Hamilton in
Duel”
Complete the
Cause/Effect chart on
the back
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1. How did the United States expand
in the early 1800s?
2. What was the purpose of Lewis
and Clark’s expedition?
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1. The United States acquired the
Louisiana Territory from France for
$15 million.
2. Lewis and Clark traveled west to
learn about the new territory.
President Jefferson was interested in
the trip as a scientific venture, while
Congress was interested in the
commercial and military possibilities.
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