After an amendment has been proposed, it must be ratified by at least of the states to be added to the Constitution

3/4

Explanation:

After an amendment is proposed it must be ratified by state conventions in at least 38 of the states (3/4 = 38). It can also be ratified by the state legislatures also in at least 38 of the states.

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a king decides to declare war on a neighboring country without the input of any advisers

after the senate and the house passed different bills and deadlock threatened, a compromise bill was worked out with the following provisions: (1) missouri was admitted as a slave state and maine (formerly part of massachusetts).