Why was george mason a antifederalist?

George Mason was an Antifederalist because he believed that the proposed U.S. Constitution concentrated too much power in the federal government, undermining states' rights and individual liberties. He was particularly concerned about the lack of a Bill of Rights, which he felt was essential to protect citizens from potential government overreach. Mason's advocacy for personal freedoms and skepticism toward centralized authority reflected the broader Antifederalist stance against the Constitution as it was originally drafted.