Why did the Antifederalists oppose the new American constitution proposed by the Constitutional Convention?

Question

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The Antifederalists feared that the new constitution would give too much power to the federal government at the expense of individual liberties. They worried that the absence of a Bill of Rights would leave citizens vulnerable to abuses of power by the government. Many Antifederalists were former Revolutionary War soldiers who had fought for the cause of individual rights and were suspicious of any concentration of power.

Why Did the Antifederalists Oppose the New American Constitution Proposed