What caused the balance of power shift in europe in the years leading up to the war

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.

List two inventions that were invented in the united states before the american civil war

The map shows information about river valley civilizations. which feature of this map best the reader determine the distance between two places?