@camcgee I’ve never read Zinn- haven’t looked much at American history. From what I can tell by reviews it seems very much in the vein of bottom-up or social history that became popular in the 70’s and 80s. Looks like it focuses on social movements like labor, civil rights, etc. instead of more traditional “great men” narratives. So you’ll hear more about lesser known slave revolts than George Washington, for example.
So it’s a different perspective than most of us probably learned in school, but I’m not sure I could really say it’s “liberal” or “conservative” in the sense people mean today. It’s more about the people than the leaders.