America is the country it is today thanks to determined and courageous individuals who made a difference in our history, and more than 50 of these remarkable Americans are profiled and portrayed here. Readers 8 to 12 will find inspiring stories like Martin Luther King Jr.'s fight for civil rights, how Katherine Johnson's math skills helped put U.S. astronauts into space, and the amazing inventions of Thomas Edison, along with those of Sitting Bull, Dolly Parton, Ruth Bader Ginsburg, Walt Disney, and John Steinbeck.