Answer:
In the 1950s, the Korean War was taking place as the Soviets were trying to spread Communism. With the end of the Korean, Vietnam, and Cold war (all having to do with stopping the spread of communism) more modern times focused on domestic issues rather than foreign issues.
The U.S. population changed drastically because of the Baby Boom (after WWII, many soldiers rejoiced by procreating). As the population increased, many immigrants came over due to war or poverty from different countries. This caused the physical appearance of the country to change from rural countrysides and farms to urban cities, resulting in the invention of the skyscraper.
Between 2015 and 2070, well. Who knows? Personally, I think that the world would head towards a more technology base society (such as those fiction future stories).
Explanation:
