Only part of US/Canadian border that's not logical is Point Roberts,WA
IMO it shud be part of Canada, not USA.
You have to drive thru Canada (BC) to get to Point Roberts.
I know why it's US territory, it's just below the 49th parallel
but it still could have been conceded to Canada.
Other strange one is northern Maine, surrounded by Canada on 3 sides, lots of Canadians from Ontario or Quebec end up driving thru Maine to
get to New Brunswick, Nova Scotia, and PEI
The border of Quebec with New York State and Vermont is set at
45 degrees north latitude, perhaps it should have been extended farther east to New Brunswick, Maine would then be about the size of Vermont
or New Hampshire.
Minnesota's "northwest angle" above 49 degrees north,
was purchased by USA to obtain more of Lake of the Woods,
by land you have go thru Manitoba to get to it (no border guards,
you voluteerly "sign in"
Alaska panhandle/BC border was "settled" in 1902 by a supposed
impartial British judge, BC/Canada wanted access to the ocean (at
the heads of various inlets/fiords), British judge sided "surprisingly" with Alaska/USA, hence no BC ports north of Stewart,BC