Answer:
As a state in America I am round on both sides and high in the middle.
You bind me and I walk. You loosen me and I stop. What am I?
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
I am a million peopleβs wakeup call
I grow up while growing down
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.