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.
He was unable to prove his theory because he didn't have any proof.
Answer:
1. the modernizing of technology
2. machines could replace human workers
3. Companies earned more money
Explanation:
1. The modernizing of technology made it easier for businesses to access and use them, which in turn made labor much less.
2. Machines could now replace workers which meant that companies could pay a one time price for basically lifetime workers .
3. Companies made more money in the fact they never had to pay workers
ever.
