The correct answer to this open question is the following.
a) I will choose Spain.
"Contact with Europeans dramatically altered American Indian societies, both culturally and economically."
When the Aztecs saw the Spaniards, white man with beards, with their armors on, and riding the horses, they immediately thought they were the gods of their prophecies. That is why Emperor Moctezuma welcomed them with open arms and offered them gold and other precious metals.
The Spanish conquerors immodestly took advantage of this situation and with some alliances with other Indian tribes and their fire weapons, they defeated and conquered the Aztecs, changing the lives of the Indians forever.
The Spanish forced changes in religion, imposing Catholicism. And the other major change was that Spaniards brought many diseases unknown by the Indians. Examples: chickenpox, smallpox, Influenza, and Malaria. These diseases almost wiped out the Native Mesoamerican Indians.
b) The SECOND nation would be Britain.
"Contact with Europeans dramatically altered American Indian societies, both culturally and economically."
The British colonized territories in North America and had many conflicts, difficult, and battles with the Native American Indian tribes. White English were interested in establishing more settlements and exploit the many raw materials and natural resources that were on the Indian lands.
So the English settle in established the 13 colonies and forced Indians to move to other places, changing the face of native North America forever.
c)The third option would be France. It is a less effective example of the statement because basically, the French had a decent relationship with the Native American Indian tribes because the French were not interested in settling many territories or colonize the land. They were totally interested in the lucrative Fur Trade.