What unions were open to african americans in the 1920s?

Why was frederick douglass encouraged by the dred scott decision?

What policy did "jim crow" laws put in place? black codes integration segregation 2. the supreme court case that established the doctrine of "separate but equal" was dred scott v. sandford plessy v. ferguson brown v. board of education 3. the supreme court case that overturned the doctrine of "separate but equal" wasdred scott v. sandford plessy v. ferguson brown v. board of education

Why do all market economies have taxes to support armed forces police forces public schools and at least some form of public transportation?