Why was the push across France (Battle of Normandy, and the Battle of the Bulge) so vital to the European Front? What was Amphibious Landings? Was it successful or could there be other ways to get troops on land there in France? - must be 5-10 sentences please

How does the supremacy clause of the u.s. constitution affect the states? o a. it requires each state to establish a supreme court. b. it declares that the federal government can take away state powers if necessary. o c. it allows state governments to overthrow the federal government if necessary. o d. it ensures that the u.s. constitution overrules each state constitution