I'm going through some stuff from Scholastic. There is a Government Pack with 5 books which look like an introduction to how our government works. They are written by Nancy Harris. The target grades are 1-4. DS is fascinated by this general topic as it is election year and a huge conversational piece in our household. I wondered if anyone is familiar with this particular set or could recommend good basic literature about government or US History. Amazon does not have any reviews, so I am a bit nervous.
There are 5 total books. Here are the books on Amazon for visual reference:
What's the U.S. Constitution? http://www.amazon.com/Whats-Constitution-First-Guide-Government/dp/1432909894/ref=sr_1_3?s=books&ie=UTF8&qid=1347579952&sr=1-3&keywords=what%27s+the+u.s.+constitution 
What's a President and Vice President? http://www.amazon.com/Whats-President-First-Guide-Government/dp/1403494711/ref=sr_1_1?s=books&ie=UTF8&qid=1347580296&sr=1-1&keywords=what%27s+a+president+and+vice+president