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Yes, we should have one state police with divisions for cities and rural areas.  New York as an example would have a very large force with multiple divisions.  Montana would maybe have two divisions.  However all would be accountable to their state legislature; have standardized enforcement, training, complain procedures ect.  
That would give us 50 police agencies and something like 18 federal departments. Much easier to manage in my mind.
In my opinion, policing has huge issues with not enough oversight, not wisely spent budgets, and not nearly enough training and qualifications as European countries for example. However, I think the biggest issue is that our Social system does not have nearly enough money and there's expectation for the police to handle everything >

Yes. When every little town has its own police force and everyone has to handle all their own administrative matters, hiring, training, etc you create a lot of inefficiency, variability in standards and performance and reduce the ability to do oversight. >

What would be the solution to that problem?
Centralized training and administrative services for multiple localities? That would save some money. >

I am from New Jersey, the land of endless local government, and the result of endless local government is crazy levels of inefficiency which cause high property taxes and governments so small nobody even sees the corruption. 
The average American town is around 6000 people. That’s way to small to justify a police department. Either roll up a few towns with a single police department or handle it at the county level. Have standards, training and as much administration as possible handled at the state level with federal guidelines that must be met and a system for federal oversight. 
Maybe start treating the police as professionals and model things more like how we license doctors, lawyers, accountants and such. >

I upvoted you and I see some merit in your argument.
It seems, though, that big metroplitan areas are where we have most of the crime because that's where we have most of the people.
THOSE cops are overwhelmed. They need more officers, and they need other responders to take over some of the problems cops have thrown in their laps.
They also need stigma-free, mandatory psychotherapy. None of this "I can take it, I'm a tough guy." Objectively, police need community support as much as communities need service and protection.
Also, no more "code of silence" or "you can't touch me when I commit crimes. I got immunity and a union." We need to KICK OATHKEEPERS out of the police department. No more gang members "moonlighting" as police officers.
Do I support the police? Yeah. Do I support the KKK and white nationalist weirdos? NO.