Federalism in the United States
People who did not support the new Constitution were called "Anti-Federalists".  The Anti-Federalists included Founding Fathers like Patrick Henry and George Mason.  They worried that under the new Constitution, the federal government was too strong, and had too much power over the states.  They wanted the states to have more power.  They also did not like the fact that the Constitution had no bill of rights.  Without a bill of rights, they worried that the federal government would take their rights away.