How Did The Population Of Native Americans Diminish In North America?

With the settlement of Spanish settlers and French settlers in North America, the hold of European powers strengthened in this newly discovered continent.  Soon after the Dutch followed suit and many groups of Dutch settlers came to live in North America, although their population grew very slowly and steadily.  Nevertheless the Dutch had more of a trading relationship with the Native Americans as compared to the relationship that the Spanish and the French settlers had with them.

They even traded for beaver furs with the Native Americans.  Nevertheless this trade relation slowly made many groups of Dutch colonists permanently settle in North America.  This increase in the population of European settlers became the source of increasing European control over North America while the Native Americans diminished in both power and population.  Many of them lost their land while many of them died from the spread of European diseases.

To add on to the previous answer... Disease was the main cause for the rapid decline in population. Small-pox was among one of the main diseases that spread throughout the Americas causing complete devastation. The devastation was so great from disease alone they weren't able to recover population to fight off evading forces.