The peculiarities or characteristics of western people; specifically, a word, an idiom. or a manner peculiar to inhabitants of the western United States—that is, of the Northern States called Western.(noun)
The Century Dictionary (Public Domain)
Use "westernism" in a sentence
"The really common thing that these people have in common is anti "westernism" - they will even ditch Muslims if it suits that agenda which is why many of them backed Milosovic in the Bosnia Serbia war."
"Here, the current political persuasions in the U.S., (though of interest to the whole world for a whiff of where westernism leads,) are intellectually wanting, when not intellectually corrupt."
"I think it's called antisemitism, although anti westernism would probably be as apt."