op sounds like one of those "obama ain't did shyt for blacks" types. one of those people that bought into trump's "you ain't shyt anyway, so what do you have to lose voting for me" types.
this is a loaded question with a very complex answer.
the economic policies you see today come from your state/local gov and overarching policies, laws, codes, regulations put forth by congress, the potus, and the people he appoints. for example, whoever heads the cfpb will have an impact on consumer protections that impact those most at risk for financial shenanigans (like black people).
if you want to talk about tax code, eeoc, state's rights, healthcare, etc, that impact black people economically....there is no argument that can be made towards the conservative/gop economic agenda being better for black people.
if you're not open to all that's involved in economic considerations you should probably stick with whatever your assumptions are about "liberal policies" and leave the heavy lifting to the rest of us.