America grew from a small set of colonies to a world power because of immigration and migration. Readers discover just how important the movement of people to and across the United States has been throughout the nation's history. They see the hard work done by groups of people from many different places to build America into the country it is today. Helpful photographs, fact boxes, and a timeline bring all the aspects of immigration and migration in America into sharp focus—from the bustling days of Ellis Island to the current debates about these issues.