The Pacific
The immediate consequence of a defeat at Midway would, of course, have been in the Pacific. The Japanese plan appears to have been to follow Midway with an assault on strategic islands in the South Pacific. They would have faced light forces on the islands and no naval threat. They would have taken islands, built airfields and constructed overlapping areas of air power that would have prevented merchant shipping from entering. The flow of U.S. troops and materiel to Australia would have slowed to a trickle or dried up altogether. This would have meant that the U.S. would not have taken Guadalcanal and New Guinea until much later. It also would have given Japan much more time to consolidate a line, for example, from Samoa to Midway to the Aleutians, which was also part of Japan’s Midway strategy.