When Trumpers say "we're going to take our country back", it sounds nonsensical, because white conservatives never lost control of the country in the first place. At no point did they have anything less than firm control of the country.
But it makes more sense when you understand what it actually means: they're not taking something they lost. They always had it. What they're doing is stopping the practice of sharing that thing with others.
"Taking back", in this context, is about stopping the generosity.
Imagine having a swimming pool, but your wife told the neighbours' kids they could use the pool. But this pisses you off because you don't like the neighbour's kids, so you went apeshit and screamed at the neighbour's kids and put up a barbed-wire fence and threatened to shoot them if you ever saw them using your pool again, and when your wife brought up the fact that she gave them permission, you started beating her up. And all the while, you were thinking that you're just protecting what's yours, and you never once thought you might be the asshole. That's what a Trumper is.