What was one effect of the decimation of the Native American population as a result of the Columbian exchange?

It resulted in the Europeans looking towards Africa for slave labour.

Explanation:

The decimation of the Native American population greatly reduced the available manual labour in the Americas. The Europeans being expansionist in nature required a great deal of manual labour and thus were looking for an alternative which they found in Africa. The African Slave Trade is one effect of this decimation.