As Woody Allen said, "80% of life is showing up." This PoD means Japan shows up 130 years earlier, and becomes a factor in the affairs of the rest of the world. Japan will end the prohibition on Japanese leaving the country, and Japanese mariners will begin to voyage around the Pacific Ocean. Japan has about half the population of France, Britain, Spain, Portugal, and the Netherlands combined, and unlike those countries, is in the Pacific, not ten thousand km away.
OTL, a relative handful of voyagers from those countries dominated the whole Pacific - because there was no competition. (There was Russia in SIberia and Alaska, but that was not important.) ITTL, Japanese voyagers will outnumber Europeans, and the Pacific islands will become a Japanese cultural and political zone of influence.
If Japan chooses to get forceful, they can probably seize or pre-empt all SE Asia from the Europeans.
Of course, all this depends on the course of Japanese politics following the Opening. One might see something like OTL's Meiji Restoration, or a fumbled mess like late Qing China. In the latter case, there would be no Japanese power in the Pacific for a long time, but there still could be a lot of individual Japanese out and about - easily comparable to the number of Europeans.
In the longer term - if Japan develops as OTL into a "Westphalian" state that is a peer of the European states, though not European, but 100 years sooner than OTL, that affects the entire thought pattern that underlay imperialism. For instance, it might kick off the Indian independence movement earlier; it could easily inspire Indian states such as the Sikh realm to pursue "Westphalian" recognition from multiple European states.
Japan could be a player in the Pacific Northwest. IIRC, a lot of the furs procured there were sold in China, which makes that trade a natural target for Japanese venturers. Japanese traders might easily be established in the Oregon Country well before the British arrive in the 1790s.
OTL, a relative handful of voyagers from those countries dominated the whole Pacific - because there was no competition. (There was Russia in SIberia and Alaska, but that was not important.) ITTL, Japanese voyagers will outnumber Europeans, and the Pacific islands will become a Japanese cultural and political zone of influence.
If Japan chooses to get forceful, they can probably seize or pre-empt all SE Asia from the Europeans.
Of course, all this depends on the course of Japanese politics following the Opening. One might see something like OTL's Meiji Restoration, or a fumbled mess like late Qing China. In the latter case, there would be no Japanese power in the Pacific for a long time, but there still could be a lot of individual Japanese out and about - easily comparable to the number of Europeans.
In the longer term - if Japan develops as OTL into a "Westphalian" state that is a peer of the European states, though not European, but 100 years sooner than OTL, that affects the entire thought pattern that underlay imperialism. For instance, it might kick off the Indian independence movement earlier; it could easily inspire Indian states such as the Sikh realm to pursue "Westphalian" recognition from multiple European states.
Japan could be a player in the Pacific Northwest. IIRC, a lot of the furs procured there were sold in China, which makes that trade a natural target for Japanese venturers. Japanese traders might easily be established in the Oregon Country well before the British arrive in the 1790s.