> However, if you put up with the change without > protesting, there is a good chance that you will > be viewed as having implicitly accepted the change, > losing your right to object to it.
I'd be surprised if the US hasn't inherited implied contracts via common law.
It's not automatic that a contract is implied, but a contract COULD be implied by action and conduct.
Specific examples where the unsigned contract has been upheld in court: http://www.jordanssolicitors.co.uk/resource/warning-unsigned... http://www.citation.co.uk/news/is-an-unsigned-contract-enfor...