Describe the 19th and early 20th century social and political reforms and reform movements and their effects in africa, asia, the caribbean, and latin america.

In the United States, the second half of the 20th century brought about historical socio-political movements that revolutionized American culture. Following the end of World War II in 1945, the U.S. entered a new era, experiencing a sharp growth in population, a successful economy, and an increased standard of living.