It is taught in school because it has to do with the world around us and it affected our country.
The best option from the list would be that "Public transportation made it possible for factory owners to live in parts of a city that immigrants could not afford," since the immigrant workers during this time were paid very little money and often lived in terrible conditions.
The Vietnam War is known to have a huge influence on America. The uncommonness of the war brought about the end of the military draft in 1973. Because of this, U.S. has not conscript troops from the general population again.
The war is also known to have in a lot of ways lowered drastically Americans' trust in their political leaders. This was because the president lied about what was going on in the war.
The Vietnam War was known to have damaged the U.S. economy. The war also reduced U.S. military morale.
A lot of U.S. soldiers about 58,000 were killed during the Vietnam War.
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The main grievance made by Civil Rights leaders during this time was that African Americans had just been asked to fight in a war for a country that didn't treat them fairly at home. The youth were mainly content until the 60s, when they were very outspoken against the war in Vietnam.
