uhhh i dont think im qualified to talk about this but i'd say theres like 15 or so things from the 19th century onwards
stuff like the satsuma-han which rebelled againt the shogunate, the shogunate collapsing, perry and the reaction of the han and the shogunate regarding the situation, the fall of the shogunate, the creation of the imperial constitution and its strictness, the fact that it gave full control over the army to the emperor, failure to westernize korea peacefully by supporting their pro-westernizing party, shinto becoming the official faith and being reorganized by the imperial government as well as buddhism being whacked to death to quell peasant unrest, the policy of the imperial faction rapidly changing from "protect tradition by destroying the shogunate" to "destroy the shogunate so we can westernize and thus gain the power to defend against the foreign incursions and protect our tradition", between 1860-1890, the rapid change of japanese policy towards the rest of asia changing from "cooperating with them so that they can westernize too and then we can build a bloc to protect against western imperialism" to "attack them and make them into a part of our empire", the latter policy was completely set in and approved by all after the victory against the russians, which to the japanese population was irrefutable proof that japan can have its own empire and protect itself against the westerners without having to cooperate with the stubborn asians, who kept refusing to do so for decades
other than that you also have stuff like the declaration of war on china, negotiations with ameriKKKa, immediate post-war, that one old bastard in the 80's who perfectly kiked the americans and gave an immense boost to the economy and so on
i would talk in-depth about these buy my memory is pretty fuzzy and in the first place all ive done is read a history book or two and a bunch of nationalist comments on niconico