Answer:
The 19th amendment
Explanation:
The 19th amendment is, "The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of sex."
The European settlers treated the native Americans like slaves. they invaded their space, set up gold mines and didnt show any respect for them or their beliefs at all. lots of native Americans were killed by the settlers, and there were many wars over control of the land. i hope this helps :)
It allowed the US to trade with other country's and it created a war