Difference in view on Japan-U.S.A contract

About words
Japan: When a dispute occurs about the contract, the person concerned discusses it in all sincerity and plans a harmony solution. (Harmony solution article)
U.S.A: The contract invalidates all conventional contracts, agreements about this matter subject between the person concerned and replaces this. (Complete agreement article)

Implication of the article
Japan: Contract is only the thing which established only the matter that is important, and the person concerned discusses it in all sincerity when a problem occurs and premises solving peacefully.
U.S.A: All the contents which agreed must be specified in contract itself. Tacit agreement and the difference contract words and agreement contents are not recognized.