How did the 1842 expedition of john c fremont contribute to westward migration ?

Which statement does not accurately describe the columbian exchange and its consequences? a. wheat became a major crop in north america where it had never existed before. b. millions of africans were kidnapped into slavery to provide labor for profitable crops. c. cattle, sheep, chickens, and pigs were brought to europe for the first time. d. spanish conquistadors brought diseases with them and native peoples begin dying.

Which is the best example of a primary source ducument useful in the study of history ?

The segments shown below could form a triangle.