Two-third's of what body is needed to propose an Amendment?
A. Executive Branch
B. Congress
C. Voters
D. Supreme Court

B. Congress

The Constituion provides that an amendment may be propesed by the Congress with a two-thirds majority vote.

I would say congress

a historian who compares the expansion of political systems to the expansion of economic systems to the expansion of economic systems is organizing history by theme.

hope this : d

porter is writing economic history because he is focusing on the cost of developing vaccines.