What is the proper order of genocides from earliest to most recent

Which of the following factors would be a likely reason for low population density

Identify the reason each country wanted to go to war in the year before and during world war 1

Did the spanish settlers and missions have a positive effect on world history? why, what did they do that was positive? why was the treaty of paris (1763) good for the world/world history? did the plymouth colony have a positive effect on world history? why, what did they do that was positive?