How did European diseases affect Americas

Europeans carried a hidden enemy to the Indians: new diseases. ... Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians. Europeans were used to these diseases, but Indian people had no resistance to them. Sometimes the illnesses spread through direct contact with colonists.

the population of the indians decreased because most of them died because of diseases such as chicken pox (not only diseases) that european settlers brought with them

to it’s stable government, it has been able to accept refugees from somalia and south sudan. (apex)

a drastic rise in oil prices ended decades of postwar.