The correct answer to this open question is the following.
The effect of conquest and settlement on the total population of native civilizations was that the European conquerors brought killer diseases that almost wiped out 80 percent of the Native American Indians tribes.
That was the case. for instance, of the Spanish conquerors in Mesoamerica, the Caribbean, and South America. Spanish people brought diseases such as cholera, smallpox, chickenpox, typhus, influenza, and measles. And of course, Native Indians had no defenses in their immune systems to that unknown diseases for them.
Adaptation because I did this already and got it right
I believe Jay Gasbty is a tragic figure in the book, “The Great Gastsby” by F. Scott Fitzgerald. Gatsby held an obsession over Daisy who requited his own love as well as her husband, Tom. He inevitably cast aside his own wants and needs in order to ensure the happiness of Daisy.