The main cause of WW1 was the assassination of the Archduke Franz Ferdinand of Austria-Hungary. The other causes are Militarism, Alliances, Nationalism, and Imperialism.
Grandfather clauses were designed to prevent poor and illiterate African Americans from voting.
This term was coined in the 19th century when new rules for literacy tests, poll taxes and requirements for voting were established.
Some white people who did not fulfill the requirements were still allowed to vote because their ancestors ( grandfathers ) had the right to vote. This was a way to make voting possible for white Americans, and to make voting almost impossible for black people.
Today, this term applies to a provision in which an old rule continues to apply to some existing situation while a new rule will apply to future cases.
Both had the economy booming, meaning they were both thriving with new homes, cars, and a lot of wealth. but in the 1950s were also an era of great conflict. For example, the nascent civil rights movement and the crusade against communism