Idont get it "explain the three reconstruction era amendments (13th, 14th, and 15th amendments). what changes were made with each amendment, and why were those changes needed."

Reconstruction Amendments. During Reconstruction, three amendments to the Constitution were made in an effort to establish equality for black Americans. ... The Fifteenth Amendment, ratified in 1870, prevents the denial of a citizen's vote based on race, color, or previous condition of servitude.

use wikipedia, i think they have this.