Japan shut her borders to almost all entrance and exit in the 1630s, some say because of fear of new ideas entering the country, some say as a move to increase the power of the Shogunate, some say to prevent the southern daimyo from gaining too much power. Yet Red Seal Ships provided lucrative trade revenues with Japanese influence already being seen as far away as Thailand a generation earlier with Japanese built ships making calls into ports as far away as Acapulco. So with that in mind, should the Shogunate permit foreign trade only by Japanese-built and Japanese-crewed ships with the caveat that all of it not already established with China (at Nagasaki) or Korea (at Tsushima) pass through *only* the city of Edo/Tokyo (under Tokugawa control), what happens?