Well, determining which manga chapter the JJK anime is on is a bit complex. Different arcs and storylines might have different alignments. It's best to consult dedicated manga and anime forums for detailed discussions and clarifications.
It's hard to say for sure. Different sources might have different opinions. You could look on dedicated manga and anime websites for the most up-to-date details.
Yes, '1408' is based on a true story. The story was inspired by a Stephen King short story of the same name. It's about a man who stays in a supposedly haunted hotel room, Room 1408, and experiences terrifying and inexplicable events.
Well, it's a bit of a mix. While it may be inspired by some true elements from 1899 such as the general state of the world, sea travel, and social hierarchies at that time, it also has a lot of fictional elements added for the sake of drama and mystery. For example, the overarching mystery plot might be a creative take on some historical uncertainties, but not directly based on a single true story.
In many cases, 'True Story' is indeed drawn from actual happenings. The creators might take some artistic liberties, but the core elements are rooted in truth.