In 1948, President Harry S. Truman used an executive order to integrate the armed forces and stop segregation based on color. It was also known as executive order number 9981. This order was passed on 26th of July in the year 1948. The segregation based on color, religion, national origin or race would be stopped and equal opportunity provided to all.
How it affected the 20th century :
It influenced the way that people think about such important social issues as race, gender, and class. It played an important role in the political process, particularly in shaping national election campaigns. TV programs and commercials have also been mentioned as major factors contributing to increased American materialism (a view that places more value on acquiring material possessions than on developing in other ways). Finally, television helped to spread American culture around the world.
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The alliance system was made up of two groups, the Central powers (Germany, Austria- Hungary, Italy(1914), and Turkey). The second group was the Allied powers (Russia, France, Great Britain, and United states).