How did the louisiana purchase affect the nation's economy and politics?

What were the effects of the Plessy v. Ferguson decision? Check all that apply. It found the Fourteenth Amendment to be unconstitutional.It established a new precedent in declaring the law constitutional. It limited the rights of African American citizens. It allowed the policy of “separate but equal” to continue.  It stopped states from creating segregation laws. 

False but idk if im right