Which states are winner takes all primaries?

In the United States, winner-takes-all primaries are primarily used by the Republican Party, with states like Florida, Ohio, and Texas employing this system. In these primaries, the candidate who receives the most votes is awarded all of the state's delegates. This approach contrasts with proportional allocation, where delegates are distributed based on the percentage of votes each candidate receives. Notably, not all states use this system, and rules can vary between parties and election cycles.