Ok burger listen up.
Take your highway system.
The highway system in America is regulated by the federal government, and from what I've seen on maps, it's idea was to link the American states. Note that the way states function in America is very different from the ways it functions in the rest of the world, the EU included.
Let's go back to the highways. In Europe, the highways don't belong to the EU, they belong to the member states, even if the EU pushes some law, the member state can wait as much as possible until it ratifies it, even thou it's obligated to do. As you can see it is very different than in the US.
Welfare is similar. Sweden doesn't pay welfare for Poland or Italy, it pays welfare to the people that live in Sweden. This means that if you decide to move to Italy, it will be Sweden who pays your pension and not Italy.
In America, no matter where you live, a guy in Florida and a guy in California will pay for your welfare.
As you can probably see now, states still have power, and as far as people are concerned they care more about their elected leader ( Cameron for Britain) than the kikes in Belgium. That's why for America, there's pretty much only Obama but for the EU for an outsider it seems that there are more people with power ( Merkel, Hollande, Cameron)
Now the EU wants to kill the states power and turn state leaders into governors. That's why they have this active campaign against populist leaders.
As far as Britain is concerned, they know they don't have sovereignty, they can't refuse to ratify an European directive ( they don't even call it a law the fucking kikes) but at the same time still have some power over the people ( Transportation, immigration (not so much), welfare, wages) and want to get that power back.
Did you understand now burger?