The most important power acquired by colonial legislatures in the 18th century was the right to what?

Control of the purse strings

Explanation:

By the early 18th century, the colonial legislatures held two significant powers similar to those held by the English Parliament: the right to vote on taxes and expenditures, and the right to initiate legislation rather than merely act on proposals of the governor.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

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