If it occurred in the years 1915 and 1935, the most significant event in the America history was that women granted the right to vote :)
They were really worried if they had to get involved in WWl (world war 1) and if they had to go out fighting and one more tension was that if they were gonna have to take part in it.
Sincerely,
Jenna
Answer:
Hey there!
This is pretty likely once a new population interacts with a native population. For example, when the conquistadors landed in South America, they killed off a lot of the Incas with their diseases.
Let me know if this helps :)
Need more than that to answer