Which of these was a positive effect of the Columbian Exchange?
Athe introduction of the horse to the New World
Bthe introduction of disease into the New World
Cthe introduction of the slavery into the New World
Dconflict and warfare between European settlers and Native Americans
Athe introduction of the horse to the New World
Bthe introduction of disease into the New World
Cthe introduction of the slavery into the New World
Dconflict and warfare between European settlers and Native Americans