My understanding (limited though it is on US history) is that the US was predominantly isolationist pre WWII
Extreme oversimplification and the term "isolationist" was used in a pejorative manner to encompass
any group who opposed or questioned going to war, be they non-interventionists - of various political
inclinations, anti-war in general, pro-peace for religious reasons etc., in much the same fashion as
those opposed to involvement in WWI were decried as being "anti-American". The number who were
truly "isolationist", who promoted turning completely inward, even to the extent of pulling back from
international trade etc., were a small minority.
The
majority were unsure but did have serious questions and concerns, many generated by the
admitted manipulation of the public that preceded US entry into the First World War and the evident
failure of the war to change anything.
The somewhat fringe right-wingers were the loudest voices amongst the anti-interventionists, stating they
opposed the US being pulled into the war by the "internationalists", a classic dog-whistle, who controlled
the governments and media of the "democracies" and presenting Germany and Japan as being victims of
"war hate" and the media as beating the drum for intervention.
Ralph Townsend was one of those more blatantly pro-Germany and Japan, Italy to a lesser extent. I have
one of his pamphlets published on May 1, 1940,
Seeking Foreign Trouble, that is extremely anti-British,
anti-French, anti-Communist and even to an extent anti-American as it condemns the US as one of the
imperialist powers. It turned out that he was accepting money from the Japanese. He's popular today with
the extreme right, militia types, anti-Semitic groups etc.
https://en.wikipedia.org/wiki/Ralph_TownsendA complicated subject and this really isn't the place to discuss it.