A People's History of the United States : 1492-Present
The Twentieth Century : A People's History (This is a shorter version of the above book)
Benevolent Assimilation: The American Conquest of the Philippines, 1899-1903
I don't know, probably one of the first two...all three have there flaws...I don't agree with Zinn on a lot of points...
Suggested conservative book
The book I have in mind is absolutely fascinating in its scope. Not really political at all, actually. But the author is despised among liberals, and probably makes modern conservatives wince. The book is "DIPLOMACY" by Henry Kissinger.
Again, this isn't really political, but it does connect the diplomatic dots between 1648-1914, revealing a complex, yet fallible system of foreign relations of Europe and America.
This is a must read in my opinion. It explains in detail why Europe went to war in 1914 and why it had to happen again in 1939.
It explains why Europe, though stable from 1648-1914, fought an incredible number of wars.
It explains Wilson's vision of American influence in the world that has been a mainstay of foreign policy since 1915.