The Anti-Federalists criticized the United States Constitution because they felt that it gave too much power to the federal government. They believed that the untested form of government would have negative effects for the country.
After the Constitution was signed in 1787, the states had to ratify it. This required the approval of the special state conventions of nine of the 13 states. The Anti-Federalists criticized the Constitution for its lack of Bill of Rights, and they argued it would be the end of all forms of self-rule in the American states. Moreover, they argued that a country as large as the U.S. could not be controlled by a single national government.