I need the rest of the question this is a statement
The columbian exchange was the exchange of wealth, crops, livestock, and most importantly disease between the new and old world. foreign people came into contact with each other and lacked the needed immunity to prevent illness. some crops exchanged were squash, corn, beans, and potatoes.
Answer:
Zimbabwe
The most powerful trade center in eastern Africa in the 1400s was Zimbabwe.
Hope it helps! :)
<span> Well here answer my the Crop rotation system began developing in Britain towards the time of the agricultural revolution which increase crop yields by increasing the nutrients in the soil. </span>
