It depends on what you take to be the beginning and what the end. It lasted two years if you understand it as from the time it was revealed to the time Nixon resigned. It lasted 5 years if you take it from the time Nixon began doing it to the time he resigned.
In what is known as The Great Migration, large numbers of African Americans moved from the rural south to northern cities, beginning in the early twentieth century. What motivated this large-scale movement?
job openings due to industrial growth in northern cities
Since you provide no options, here are some tactics that companies usually used to hurt unions :
- Craft Workers formed trade unions
- They require workers to take oaths promising not to join unions
- They made the blacklist for the members of the union
hope this helps
