Pick a fight with a liberal on:
IMPERIALISM.
Liberals hate imperialism because in their mind it's all about the big bad West holding its big bad sway over the rest of the world. Liberals are much more comfortable with Western retreat and "multiculturalism" than with Western dominance and triumphalism. But America, Canada, Hong Kong, Singapore, Malaysia, India, and Australia did pretty well out of imperialism, didn't they, inheriting the ideas of English liberty and law, free market economics, representative government, the English language, etc.? And if you think some people wouldn't welcome a return of imperialism, you might take a trip to Zimbabwe and see what the starving folks there have to say.

Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
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Scarlet Chord Ministries   Isa 1:18