I just finished a great book: 1776, by David McCullough. McCullough, a well-known historian and writer, does a masterful job of detailing critical points in the American war for independence. He shows George Washington and the Continental Army as being critical to American emancipation, and shows how they were vital to upholding the Declaration of Independence and its signers.
One of the greatest aspects of thus book is all the in depth research that McCullough did. He knows the period and he knows the characters. He has a great command of the language and uses it brilliantly to portray America's defining hour.
The book is 294 pages long--and it's not a difficult read. I found his descriptions of some of the battles more understandable than what I've read of the same battles in some historical fiction novels. It's not a comprehensive history of the war--it only covers the last part of 1775 through the Battle of Princeton. But sometimes the more focused books are the best!