Answer:
The changes that the second wave of feminism brought about were the eighteenth and nineteenth amendments. The eighteenth amendment was for prohibition and the nineteenth gave women the right to vote. Thought the nineteenth amendment still stands today, the eighteenth was later repealed.
Note: Many people regard the second wave of feminism as the time period that came just after WWII, however that is actually not the case. The first wave of feminism was actually at the time of slavery when women helped in the emancipation cause. This is not widely regarded because it was not focused on women's rights. However, feminists knew that in order for women to gain the right to vote and right to own property, male slaves would need that right first. And they also knew they would gain the popularity and support of the slaves once emancipated.