American Independent from day one to the end.
I think you misunderstand slightly. They want to increase the power of the United States, giving power to a reactionary segregationist party would not serve that purpose. How could the US rule over Africa if they cannot accept blacks as equal citizens? European colonialism is dead and domestic strife would decrease US power and increase the appeal of communism worldwide, especially in Africa.
They could of course simply be a dimwitted white nationalist, but that's not the premise we're working with. This is someone relatively moderate domestically.