For what reason did the tokugawa shoguns expel all foreign traders except for the dutch?

the mother countries succeed in doing that by using the colony's natural resources, facilities in a colony, they do not take good care of these facilities, causing them to fail. this has had negative and positive effects on the people of africa, they then governed through direct or indirect rule depending on the country.

hope thsi

answer; /// i do believe that its napolean's conquest of spain;