According to the Trump administration, those ideologies include, quote, anti-Americanism, anti-capitalism, and anti-Christianity, all of which sure sound pretty vague.
Some expressions that the British call" Americanisms" are in fact original British expressions that were preserved in the colonies while lost for a time in Britain.
Americanism would have been bad form in the liberal Edinburgh Review; it would have seemed eccentric even for a Scotchman, and Reeve was a Saxon of Saxons.