This clause prevents states from passing laws that interfere with existing contracts between private parties, or contracts between a private party and the state. In two early Supreme Court decisions, Chief Justice John Marshall used this clause to invalidate state laws that interfered with prior grants by the state in ''[[Fletcher v. Peck]]'' (1810) and ''Trustees of Dartmouth College v. Woodward'' (1819). These decisions held that a state could not abrogate (nullify) its own prior contracts with private parties. | This clause prevents states from passing laws that interfere with existing contracts between private parties, or contracts between a private party and the state. In two early Supreme Court decisions, Chief Justice John Marshall used this clause to invalidate state laws that interfered with prior grants by the state in ''[[Fletcher v. Peck]]'' (1810) and ''Trustees of Dartmouth College v. Woodward'' (1819). These decisions held that a state could not abrogate (nullify) its own prior contracts with private parties. |