Uhh, no, a simplistic article from wikipedia about the "Old Right" and the America First Committee which cites as many Democrats as Republicans doesn't give me any history.
You stated The GOP used to be a party of non-intervention and I requested that you support your contension that The GOP used to be a party of non-intervention with some credible examples. I'm looking for Republican Presidents in time of international crisis who practiced non-intervention.
You provided none. Guess what, there are none in the post WWII period, every Republican has followed interventionist policies at one time or another.
Your article cites Hoover and Harding, Republican Presidents at least. And they along with Coolidge were engaged in continual warfare in Central America. Though I don't think it was an important electoral factor, that was ended by FDR's Good Neighbor Policy, so I suppose you could attempt to argue that Republican interventionism let to a "non-interventionist" President, though a Democrat. Your analogy doesn't stand up to scrutiny.
BTW, I'm not sure I'd lood to Hoover or Coolidge as examples for Republican's to follow anyway, I suggest you consider Garfield. He engaged in a non-interventionist foreign policy while in office.