I need to know the context of the situation. if this is now then its completely different from say the 1870's or late 19th century
The concept that completes the fragment is Cross-voting.
Cross-voting is a form of voting in which the elector has the right to vote differently in elections. Cross-voting allows the voter not to favor a single party but can vote for two different parties during an election.
For example, a voter leans for a state government candidate who belongs to the Democratic party, while at the national level he leans for a Republican candidate. He votes for each of them, this is known as a cross vote.
According to the above, the fragment would look like this:
Voting for one party on a state level and the opposite party on a national level is known as Cross - voting.
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The challenges that the nation faced after the Civil War was money
(1) the United States would not interfere in the internal affairs of or the wars between European powers; (2) the United States recognized and would not interfere with existing colonies and dependencies in the Western Hemisphere; (3) the Western Hemisphere was closed to future colonization