Slavery it wasn't needed for west expansion
Answer:
Among the most lucrative goods transmitted in the Columbian Exchange were sugar, corn, and tea. Columbus himself is credited with bringing sugar to Hispaniola, setting up sugar cane plantations after Spanish miners had exhausted the gold stores there....
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Good climate and ample food supply
The environment of the west coast was attractive for settlement because it had great weather and plentiful natural resources. The climate of the west coast was mild and it had dependable food that attracted the Native Americans
The Senate is the branch of Congress in which each state is represented equally.
At the time of the arrival of Europeans, the indigenous population was estimated to be just below 40 million people. After the contact with European diseases it is said to be significantly reduced and estimates suggest that in 1650 this population could be around 8-9 million people. (this is just an estimate, but it's the best from all the offered answers).
