In the 1900 mod, you start the game on January 1, 1900, with the geopolitical situation for that year. You have all the states and movements of that time to choose from. You will not have aviation and modern weapons (until you design them). There will only be various ships, artillery and cavalry. Research now lasts much longer and is more realistic. The fashion also has its own music, which will further immerse you in the atmosphere of the early 20th century.