Name one improvement for African Americans after World War II.

Martin Luther king

Explanation:

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.  

the national congress's powers over the states were specific and definite: it had the sole power to negotiate treaties, declare war, and make peace. all powers not granted to congress were reserved for state governments. congress had no power to levy taxes, for example.