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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Answer:
Thrust and lift are artificially created forces used to overcome the forces of nature and enable an airplane to fly. Airplane engine and propeller combination is designed to produce thrust to overcome drag.
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Answer:
The WW1 draft caused a shortage of labor in the northern factories and African Americans migrated to take advantage of new job opportunities, better education and modern facilities of the cities
