95%+ of the ipad is made in Commie China and Taiwan. (my guess) You would be hard put to find a chip actually made here but it might well have been designed in USA by Apple or a US partner
As far as the intellectual efforts to design and make such a device. My guess is 60-65% by Apple meaning American talent or at least foreigners laboring for Apple
The rest of the intellectual effort is Taiwanese and from Mainland China. (my guess)
Apple owns the CPU company. They have some of the brightest engineers on the planet. They hire the right consultants as well. Why do people feel the need to disparage such a successful company? Is it jealousy? Sour grapes? Stupidity?
The A4 is based on ARM processor architecture.