Shubhanan Kulkarni

They were made at the time of the American Reconstruction after the end of the civil war. That is why they are also known as the "Reconstruction Amendments"

13th amendment: Abolished slavery

14th amendment: American citizenship will go to anyone who is born on American soil, regardless of race or ethnicity.

15th amendment: any American citizen (male), regardless of race, color, ethnicity, and etc has the right to vote.