"Manifest Destiny" was the belief that the United States was meant to reach from the Atlantic Ocean to the Pacific Ocean. The story of how it was achieved is full of excitement, which readers discover as they explore this pivotal period in American history. Important social studies curriculum topics, including immigration and westward expansion, are presented in an engaging way. Historical images allow readers to place themselves on a wagon train or a railroad. Primary sources are included throughout the text to help readers gain experience relating those sources of information to what they know about history.