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Jefferson Alters the Nation’s Course
KEY IDEA
The United States expanded its borders
during Thomas Jefferson’s administration.
OVERVIEW
ASSESSMENT
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Jefferson Alters the Nation’s Course
OVERVIEW
MAIN IDEA
WHY IT MATTERS NOW
The United States expanded
its borders during Thomas
Jefferson’s administration.
Part or all of 15 states now
occupy the territory Jefferson
acquired in the Louisiana
Purchase.
TERMS & NAMES
• Lewis and Clark
• Sacajawea
• Judiciary Act of 1801
• midnight judges
• Aaron Burr
• Marbury v. Madison
• judicial review
• John Marshall
• Louisiana Purchase
ASSESSMENT
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Jefferson Alters the Nation’s Course
ASSESSMENT
1. List the major accomplishments of Jefferson’s
presidency and the significance of each.
Event
Significance
Simplified the presidency
Introduced Democratic–Republican
principles
Louisiana Purchase
Expanded size of the U.S.
Louise and Clark expedition
Increased knowledge of the West
continued . . .
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Jefferson Alters the Nation’s Course
ASSESSMENT
2. How did the Louisiana Purchase and the Lewis and
Clark expedition affect the expansion of the United
States?
ANSWER
With the Purchase, the country received a great deal of
land. The expedition provided valuable information
about the new territory that would help settlers survive
there.
continued . . .
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Jefferson Alters the Nation’s Course
ASSESSMENT
3. Why was Marbury v. Madison such an important
case? Think About:
• Judge Marshall’s decision
• its effects on the future
ANSWER
It affirmed the principle of judicial review. The Supreme
Court could declare a law—such as the Judiciary Act of
1789—unconstitutional and thus be an effective check
on the legislative branch.
End of Section 3