What Zinn fails to take into account adequately is the gradually rising levels of prosperity, and longevity, for the average American citizen and the benefits that other countries too have achieved by constructive partnering w the U.S. ... Why would he? He'd have to then acknowledge the superiority of capitalism over his obvious Marxist bent.
Note that his book is not widely assigned in even the predominantly left-leaning institutions of "higher learning"... and it's also finally being acknowledged that Marx himself made up "fictional historical facts," for lack of better term - including a bizarre fantasy of how great life was in the Eden of some non-existent fictional perfect barter system before the greedy rise of private property - to fit his ever-changing theories, rather than making the theories fit the facts, which is ironic because Marx claimed to be offering a "scientific" look at economic history. Nevertheless, Marx, like Zinn, is a stimulating and provocative writer, and worthy of being read at least for the challenges laid down.
Zinn did write a good book though, and food for thought. Does remind one of the nastiness and brutality of which the human race is capable. Met him once.