What happened during the columbian exchange?
a. spanish explorers traded food for gold in latin america.
b. columbus returned to the americas six times.
c. plants, animals, diseases, and people moved among continents.
d. thousands of people from the americas migrated to europe.

According to us supporters, which was a benefit of purchasing alaska? the territory would be a buffer to invasions from europe. the territory would provide a place for many americans to live. it would increase trade by improving access to the northern pacific. it would increase the united states’ power by creating a bond with russia.