can a person be fired with no given reason

In most places they can unless there is a union. Also, there may be an employee handbook that give you a notice right.

Absolutely, especially in ''at will'' employment states.

If the employer does not give a reason, then you do not have a reason to be able to sue.

Have you applied for unemployment? If they deny your unemployment they will have to give a valid reason to the unemployment office.

Sorry, and good luck in your search.

if you are on probation then yes otherwise they need to give you a valid reason or take it to the labour board

Yes, the owner can directly fire a person, but it hurts the company as it has to go through the process of finding a replacement (which can not only take time, but reduce profits), think of it that way.

They can...if you do not have a contract your gone....life in the business world.... l got laid off 7 months before l intended to retire....suck it up and move on....