I remember 2001 and Global Imperial Nippon's problem with the outlaw mutant hoverbike gangs. That was after 1941 when the strange civilian teleported in and helped Japan win the war, but before 2010 when the Last Great Human Empire was crushed by asteroids.
1990: Iraq's rebellion against Japan comes to a sudden and mysterious end, ensuring Japan's continued dominance until their ill-fated attempt at conquering space.