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.
Answer:
Reasons of migration
Persecution because of one's ethnicity, religion, race, politics or culture can push people to leave their country. A major factor is war, conflict, government persecution or there being a significant risk of them.
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Early settlers made useable products from raw materials. Besides trading with Indians, making their own things was their only option. Except for the fact that the Indians were not happy to see the settlers moving into their lands. Early fur traders were successful in trading with Indians because they did not settle and build homes and farms. Settlers were viewed as unwelcome so not much trade occurred. Also, travel was difficult so there were not very many resources imported from the east or ordered from catalogues. The correct answer is making their own products from the raw materials that were available to them.
