This book, the fifth in the series, has a little bit of overlap with the previous book. The overwhelming focus of this book is westward expansion and the build up to the Civil War. There is also some discussion of women's rights.
I will say I was pleasantly surprised that there were some influential moments in history that were covered which most books, such as some of the famous poets and authors, and about the whaling industry in New England. It went far more in detail about the effects of the invention of the steam engine and the beginning of railroads across the country than I'd ever gone into in school. They even talked about the Mormons and their journey to Salt Lake City.
However, I will also say that there hasn't been much effort put into creating a balanced view of history when it comes to the South. It seems like every reference in the book paints the South in the light of slavery and views on slavery, even though it does mention well-known Southerners (and slave owners) that opposed the idea of slavery. Beyond the slavery issue there was little talk of life in the South or political views on anything other than slavery. It was the one area where it seemed there was little effort put into creating an in depth view of what was going on in the country. Even if the author doesn't like or support the views or lifestyles of the people in the south, it could have still been covered in a little more detail. It felt like it fell a little flat.
Otherwise the book did cover a good deal of topics in American history, so many of which were glossed over or ignored in traditional school settings. It even went so far as to mention the Donner party, even though she only went so far as to suggest the reader look into it on their own, considering it to violent and gristly for this series. Overall I'd say it provided a pretty good view of American history during this period and covered much of the necessary knowledge to go into understanding the start of the Civil War.