How did the U. S. enter formally World War I? A. by forming an alliance with Italy
B. by declaring war on Germany
C. by moving to occupy Austria-Hungary
D. by invading the Ottoman Empire

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