The case of Marbury v. Madison established the principle of judicial review.

Chief Justice John Marshall and President Jefferson agreed on all political issues.

Jefferson was concerned about the number of Federalist judges appointed by John Adams.

Under pressure from both Republicans and Federalists, Jefferson agreed to replace a number of Federalists with Republicans but refused to replace all Federalists.

Although Jefferson had battled Hamilton over the constitutionality of the Bank of the US, as president he kept the Bank in place.

Once in office, Jefferson increased military spending and increased domestic taxes.

Jefferson was the first president to walk to his inauguration.

The victory of Thomas Jefferson and the Republicans gave proof that the leadership of the US could change hands peacefully.

Along with Thomas Jefferson's victory in the 1800 election, the Federalist Party had won control of both houses of Congress from the Republican Party.