By the middle of the nineteenth century,the Supreme Court begun to declare many federal and scores of state laws unconstitutional.

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This is true. The Supreme Court's power of judicial review, established in Marbury v. Madison (1803), allowed it to strike down laws that were deemed unconstitutional. This power was more extensively exercised in the mid-nineteenth century as the Court expanded its interpretation of the Constitution and became a more powerful national institution.

By the Middle of the Nineteenth Century,the Supreme Court Begun