Solving the housing problem at a municipal, county or state level doesn't make any sense, without adding internal passport controls and internal visas. Housing is a national problem that needs to be handled by the federal.

I have no problem using my Federal taxes to house the homeless. But I can't stand when my city tries to house people using my property taxes. It doesn't make any sense, they have no control over the inputs. It's creating an incentive at the national level to relocate to my city/county/state.