Which of these individuals was not a member of the Republican Party?

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be "Franklin D. Roosevelt" since he was one of the most progressive Democrats of his time.

Explanation:

The party, additionally cited because the party (abbreviation for Grand recent Party), is one amongst the 2 major political parties within us, the opposite being its historic rival, the political party. The party is called when political theory, an insignificant ideology of the American War of Independence.

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be "Franklin D. Roosevelt" since he was one of the most progressive Democrats of his time.