Prior to the enactment of the Seventeenth Amendment, why did some states not send two senators to Congress?

Before the Seventeenth Amendment, state legislatures chose U.S. senators. If the legislature could not agree on a candidate, it could deadlock and leave one or both Senate seats vacant. Thus, some states did not send two senators because they could not decide whom to elect; the correct choice is “They could not decide who to elect.”

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