I never knew ...

... that Kenn had such a resource available:

Before the Civil War ended, State “Slave Codes” prohibited slaves from owning guns. After President Lincoln issued the Emancipation Proclamation in 1863 and after the Thirteenth Amendment to the U.S. Constitution abolishing slavery was adopted and the Civil War ended in 1865, States persisted in prohibiting blacks, now freemen, from owning guns under laws renamed “Black Codes.” 

He starts in the 1600's and goes through 1995 listing some of the more notable laws that barred blacks from arms.

Go. Read.

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