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I then understood what the format was like. If I'm not mistaken, "soccer" in your country is like that too.

There is no demotion.

I can assume the NFL and NBA are like this too.

I think you are correct. I do not know about soccer but never heard of them having that type of system.

NFL and NBA are certainly like MLB.

It's even strange (for me, of course) when I see how a sport is organized differently than what we have here in Brazil.

But in any case, competitions in the United States are quite interesting and exciting.

Yeah. They set things up differently. Soccer is the only one I know where lower ranked teams move down a league and others can move up.