Where in there does it create law preventing enforcement of federal law or state law? 

I'll give you a hint... it's a resolution... a statement of objection... but creates no law, nor levys a fine or punishment. It does not prevent city workers from complying with federal law or for that matter prevent from assisting federal law enforcement. It does not put up a magical force field making Homer a sanctuary city. 

It's nothing more than an objection to the behavior of our dually elected POTUS. 

While I'm not sure that I agree with their resolution, as I don't believe elected officials should be doing resolutions of partisan nature. Resolutions should be used only to recognize events, persons ect as an honor, but this was not creating law that prevents federal or state law from being enforced.