An amendment proposed by Congress becomes part of the Constitution when it is ratified by what

Amendments proposed by Congress or convention become valid only when ratified by the legislatures of, or conventions in, three-fourths of the states (i.e., 38 of 50 states).

Explanation:

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

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