Ans; European colonization of the Americas began in earlier of the 10th - 11th century.
In 1492 European colonization started.

The changes that are brought to world populations are ;
1. Eventually, the entire Western Hemisphere came under the ostensible control of European governments, leading to profound changes to its landscape, population, and plant and animal life. 
2. A dramatically widespread exchange of animals, plants, culture, human populations (including slaves).
3. Population and territories are changed.