I don't really know but the European Americans took land from the native americans
There were many adnvantages and disadvantages of European exploration on the Native Americans
The Native Americans shared strategies for finding food in the area. Europeans introduced European farming practices, as well as European crops.
The Europeans started to use the Native Americans as slaves.
European lands claim to Native Americans by battleing their fears
Native Americans didn’t adopt European dress unless they were forced to.
European missionaries introduced Christianity to the Native Americans
Is this your question?"(What) effect did Native Americans (have) on aspects of (the lives) of European(s) living in America?"
the country with the best relationship with native Americans was?
yes
C.Disease
Mestizo.
The Native Americans had land. The European Settlers wanted it. That is not just the "most likely" cause, that is the cause.