What is the effect of the supremacy clause in the constitution? a. states cannot pass laws that contradict the constitution. b. the structure of government cannot change over time. c. states can prevent the federal government from becoming tyrannical. d. states cannot create and enforce their own laws.

the answer is c. to explore the louisiana purchase

possible the invasion of room could have been avodiable but the people of rome were to stubboron and to wealthy the kingdoms saw them as a threat if they dialred it downa   bit ten i dont think they wouldnt failed   china was not iacvvdoaible they caused war to much and were out of hand therefor that must have happened india i dont really know it could of