The purpose of the Iwakura Mission was not only to do research of the systems of western Europe but to make primary arrangements for revising the treaty, and in fact, the negotiation of the revision was prepared.
上記の岩倉使節団は西欧諸制度の調査も目的であったが、条約改正のための下準備という面もあり、実際交渉も準備された。