We're all nations of immigrants, unless we live in the Rift Valley. But that aside, it's nativism.
I don't know how many founding fathers were born in the British Isles but I'd guess one or two. I would think many more would have been born in the American colonies but in the nature of the first generation born on the new soil they probably felt the strong need to reject the parental nation (and given what it was like in the 18th Century I can't blame them!).
I'm not condemning them Kathianne, their patriotism is natural. They wanted their presidents to be be born on American soil. But perhaps it's time for a relaxation? After all even the Brits found it far preferable to have protestant monarchs from Germany and Holland rather than British-born Catholics.
I'm just looking at my watch...any minute now.......