So I'm writing a fictional novel set in Japan.
Right to the business I need to know when would this events happen in actual timeline and how would be other country's technology and weaponry in those times.
1 is before 2, 2 is before 3 all the way to the end.
Starts when guns haven't gotten popular in Japan. Portuguese invade Japan but are stopped and backed by Samurai's newfound power.( fictional stuff ) (don't need technology and weaponry just the time)
Japan gaurds itself heavily with the users of this power. Thus it is isolated from the outside world for roughly 1.5 centeries.
Within this time of isolation Japan turned against itself and went to a civil war, small governments wanted all of that "power" for themselves. ( What are new "notable" technologies that were founded by Japanese men and women within this time and not bringed by outsiders?)
At the end of this war, the loss was so much to prevent more loss most of the governments signed a peace treaty to never teach that power to public and for all of them to fall under a global government. Only the soilders of that government (which still isolated Japan from outsiders) were teached by the ways of that "power".(At this point outsiders given up the hope to even go to Japan as freindly ones, they just kinda said "forget about that country")(What would be the period this part of timeline is happening at in the Japan's own history?)
Hi there - we're happy to approve your question related to your creative project, and we are happy for people to answer. However, we should warn you that many flairs have become reluctant to answer questions for aspiring novelists and the like, based on past experience: some people working on creative projects have a tendency to try to pump historians for trivia while ignoring the bigger points they were making, while others have a tendency to argue with historians when the historical reality does not line up with what's needed for a particular scene or characterization. Please respect the answers of people who have generously given you their time, even if it's not always what you want to hear.
Additionally, as amazing as our flair panel is, we should also point out that /r/AskHistorians is not a professional historical consultation service. If you're asking a question here because you need vital research for a future commercial product such as a historical novel, you may be better off engaging a historical consultant at a fair hourly rate to answer these questions for you. We don't know what the going rate for consultancy work would be in your locality, but it may be worth looking into that if you have in-depth or highly plot-reliant questions for this project. Some /r/AskHistorians flairs could be receptive to working as a consultant in this way. However, if you wish for a flair here to do this work for you, you will need to organize this with them yourselves.
For more general advice about doing research to inform a creative project, please check out our Monday Methods post on the subject.