1776 book related question

McCollough has written several other books, but none that I know of about the Revolution. I think his latest was a biography of John Adams.

Not really in the same style, but still a good capture of that period are Rise to Rebellion and The Glorious Cause by Jeff Shaara. They are both listed as "historical fiction" because he puts words in the mouth and heads of the characters, but his research is detailed for all of his books and he gets it right. Rise would go back over events covered in 1776, but would fill in info from beforehand and then certainly the two together carr the war from Trenton on through the surrender at Yorktown.

Narrative non-fiction.

There's the obvious answer: Shelby Foote.

Less obvious, Stonewall Jackson and the American Civil Ware by GFR Henderson.

Those are both pretty tough/long reads. An easier read: America: The Last Best Hope by Bill Bennett. My vote for the easiest and best two volume read of American history you can buy.