Yes, abstract expressionism, but also other mostly US-led scenes like pop art to a degree.
>Second, why would anyone fund specifically abstract expressionism and for what purpose given the diversity of art movements of that time?
It had a US lead at the time, easier to explain US institutions promoting and do cross-continent exchanges and sponsorships, and conveniently apolitical compared to other art movements of the time.
>Third, what do you even know about contemporary art of Europe to make such bold claims?
Quite a lot, being from here, and familiar with both their history and the relevant literature.
A hardly a bold claim at all, it has been studied and reported in books such as "The Cultural Cold War: The CIA and the World of Arts and Letters" (The New Press), "How New York Stole the Idea of Modern Art: Abstract Expressionism, Freedom, and the Cold War" (University of Chicago Press), "Pollock and After: The Critical Debate" (Harper Collins) and others, and of course the topic of TFA.
Your opposite claim would be the bold one.