I think it is not state spread vs. federal, but more like state spread -> federal. Disclaimer: talking about the US. For something simple that can stand on its

I think it is not state spread vs. federal, but more like state spread -> federal. Disclaimer: talking about the US. For something simple that can stand on its own, that was what we saw with gay marriage and, I personally believe, what we will see with cannabis legalization. For something as complex and interconnected as property taxes, I don't think it will be that easy to convert it to federal, so state spread is what we can hope for in the near future. An example of a similar issue is income taxing, where we ended up with a two-tiered solution: one federal (same for every state) + one state (differs for each state, with some having none at all).