BTW, isn’t Trump also technically a New Englander?
No, Trump’s a New Yorker. The Bushes were something of a mixed bag. New England roots if you go back far enough, but GHWB’s grandparents were from the Midwest. His father settled in Connecticut and became a senator from that state, but he worked in NYC. GHWB moved to Texas, and his children grew up there. GHWB was born in Massachusetts, GWB in Connecticut, and Jeb in Texas.
WASPism is a state of mind. Pretty much all of our presidents were White Anglo-Saxon Protestants. Kennedy was the exception, and maybe Van Buren was too. Eisenhower was of German ancestry but assimilated. Obama is hard to categorize, but probably not a WASP.
With time though, WASP came to imply a degree of privilege. GHWB came from that world of privilege (Social Register, Episcopalian, Mayflower and Revolutionary War ancestors, old money, investment banker father, prep school, Yale, Skull and Bones, CIA) so he counts as a WASP in the privileged sense.
GWHB would have been an acceptable member of his father’s banking firm or gentleman’s club. His son, or Trump, or Clinton, not so much, though heaven knows the investment banking world has changed a lot since Prescott Bush’s day.