Why did the Federalists think it dangerous to leave too much power to the states?

Anti-Federalists argued that the Constitution gave too much power to the federal government, while taking too much power away from state and local governments. ... Anti-Federalists feared the nation was too large for the national government to respond to the concerns of people on a state and local basis.

Explanation:

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the main concern with the first draft of the articles of confederation was too much power in the state governments.