The document summarizes key events in the history of the Americas during the 19th century. It discusses how native peoples were conquered or forced to assimilate as new governments formed. It also describes population growth through European and Asian immigration to North America, which led to western expansion and war with Mexico. Finally, it outlines several important battles between European powers and in the American Civil War, including Antietam, which resulted in the highest single-day loss of life in American history.