Britannica Educational Publishing 
America Between the Civil War and the 20th Century 

The newly reunified United States experienced a tenuous peace following the American Civil War. It was a period characterized by great technological advances, but also by increased political, economic, and social polarization. This penetrating look at American history between the Civil War and 20th century includes firsthand accounts that reveal the prevailing ideologies of the time and shed light on significant people and events.