Why were native americans more likely to die from the diseases the european settlers brought to america than the settlers themselves?

Because the Europeans had already been exposed to the diseases and had built an immunity to it, and the Native Americans hadn't, hope this helps

European diseases and epidemics pervade many aspects of Native American life, both throughout history and in the present day. Diseases and epidemics can be chronicled from centuries ago when European settlers brought diseases that devastated entire tribes to the modern day when Native Americans face serious struggles with particular diseases. The current crises in diseases and epidemics are addressed by many different groups, both governmental and independent, through a multitude of programs.