Why was the open door policy an appropriate term for us policy toward china?

What refers to the division of power among the three branches of government

Which country was the last to join the allied powers? o great britain o france o united states o china

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