Hello There!
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In Congress, screening bills for floor consideration is a major duty of "Committee Members"
I believe 3 is the answer, because I think the U.S bought a part of Mexico.
The civil war is most probably one of the best researched conflicts in world history. However, there is still a lot of space for discussion and speculation.
The correct answer is amending the Constitution.
In Article V of the US Constitution, it discusses how there needs to be a 2/3rds vote in both the House of Representatives and the Senate. Along with this, the possible amendment needs to be ratified (aka approved) by at least 3/4ths of the states within the US. If both of these requirements are met, then the bill becomes an amendment.
