How were the 13th, 14th, and 15th Amendments similar?
They were immediately approved by all of the states
They helped African Americans gain civil rights
They were based on the idea of "separate but equal"
They helped Southern States set up new governments

They helped African Americans gain civil rights

Explanation:

The 13th amendment abolished slavery

the 14th amendment made it illegal to treat African Americans without any other rights of any other American citizen.

The 15th amendment allowed African Americans to vote despite their color, race, or ethnicity.