AHC/WI: Texan "Liberia"

How could Texas become a homeland for freedman black Americans?

What would the effects of this be? Western settlers would pass through this region before reaching California, for one.
 
Texas remains independent. Civil War still happens for some such reason. Texas supports the South. The Union conquers Texas. As punishment, the Union offers 40 acres and a mule to all freedmen, but only in Texas.
 
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