Were Americans afraid of British and French Imperialism until WWII?

[Statilius the Epicurean]

French imperialism ceased to be a threat after the US civil war with the failure of Napoleon III's intervention in Mexico.

British imperialism gradually lessened in threat post-civil war until by the end of the 19th century Britain realised it was no longer feasible to maintain naval supremacy against all comers, leading to the Anglo-American rapprochement around 1900 where Britain tacitly accepted that the Americas were to be left to the US navy in exchange for benevolent support elsewhere. I don't know much about domestic US political calculations which went into this but it mostly took shape during the presidency of the heavily Anglophile Theodore Roosevelt.