They felt squeezed between the wealthy and the rising working class
The answer is A because for starters, B has nothing to do with the Mexican American War. It is not C because Great Britain was neutral and had nothing to do with Mexican American affairs. It is not D because California had already declared independence and was not part of the U.S. The Union had nothing to do with California.
The answer is steel which is very hard and strong. It is a lot as a structural and fabricating material.
In the new writing of the Constitution, Shays Rebellion had a big impact. It persuaded the current President, George Washington, to renter the public services.