Why were some americans opposed to the constitution?

The Anti-Federalists were opposed to the ratification of the Constitution because they felt as though it gave too much power to the national government.

The Anti-Federalists were opposed to the ratification of the Constitution because they felt as though it gave too much power to the national government ... Anti-Federalists feared that a tyrannical, national government would take rights away from American citizens (as the British had done).