Answer:
In many hall ways you would stand if not with me in hand.
As a state in America I am round on both sides and high in the middle.
I am a type of animal that hang out in the mist
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
In my yard there's a bed with no pillows a trunk with no clothes a branch with no leaves. What am I looking at?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.