The political strategy in which the Republicans and Populists joined together was known as___________ movement.

The political strategy in which the Republicans and Populists joined together was known as the "Fusion" movement. To determine the answer to this question, we can follow a few steps:

1. Understand the context: The question is about a political alliance between the Republicans and Populists. This indicates that we are looking for a term or movement that refers to this specific collaboration.

2. Use reliable sources: Good sources for historical information include textbooks, online encyclopedias, or scholarly articles. Using these sources, we can search for information on political alliances between Republicans and Populists during a specific time period.

3. Analyze the information: Once we find relevant information, we can compare and analyze it to identify any common terms or movements associated with the alliance.

In this case, the Fusion movement is the term commonly used to describe the alliance between the Republicans and Populists. This collaboration primarily occurred in the late 19th century, especially in Southern states, where these two parties joined forces to challenge the dominance of the Democrats.