Its largest shareholders are all American, they were founded in America, by Americans, headquartered in America, and almost all it's employees live in America and are American.
My guess is that Google considers itself American.
though I'm an American who lives in California, i feel zero loyalty to Google.
and that absence of loyalty is reciprocated. Google isn't doing me any favors.
if Google disappeared tomorrow someone else would step into replace them. and i wouldn't care if they headquartered in Buffalo or Barcelona or Beijing.