The document provides a brief history of America, describing how the first people arrived in Alaska around 30,000 years ago and migrated south, becoming the Native American tribes. Europeans started arriving in the 16th century and brought slaves from Africa. Large numbers of immigrants continued arriving until the mid-20th century. It also summarizes changes in two American cities, Seattle and Atlanta, which have grown significantly in recent decades and discusses traditional American foods like turkey and mashed potatoes on Thanksgiving.