Osean culture is a melting pot of various influences, attributable to its long history of immigration. The roots of modern Osean culture lie in its initial settlement by Anean refugees, however. The nation's political system adopted in the 18th Century is modeled after the ancient Anean Republic, its tradition of cultural and political liberalism is based on Anean perceptions of morality, and the Anean language influenced the development of modern Western. The Oseans' flight from Anea was mythologized in the Aeneid, a fictional and romantic tale of their journey to the new continent and subsequent settlement.
Though the Niagara have shrunk in numbers relative to ethnically Western Oseans, their confederate model of governance influenced political thought in Osea, shifting it towards support for the limited regional autonomy seen in Osean statehood today. They remain a semi-autonomous entity as the state of Niagara, where their culture has been largely assimilated with Western traditions, but their cultural legacy is still noticeable on the east coast.
The same cannot be said for the Ohmésêhese, however. Nearly hunted to death in the 18th Century with survivors split up between plantations, the culture of Plains tribes died out quickly. However, with the limited influx of non-Abrahamic Sotoans - who had developed a distinct culture while in bondage to the dominant Islamic civilizations of the region for the past millennium - to Osean land, many Ohmésêhese adopted that culture as their own, and it has remained the predominate influence of inner city culture in the 20th Century.
Voluntary immigration, meanwhile, more uniformly affected Osean culture in the 19th Century. Disadvantaged immigrants - particularly those from Emmeria and the Twinkle Islands - came in large numbers and significantly established a foothold of Catholicism on the east coast and in New Anea. They have mostly assimilated into mainstream Osean culture while retaining distinct regional offshoots where they settled.
In the modern era of globalization, Osean mass media and global presence has resulted in a massive exporting of its culture worldwide, much to the chagrin of traditionalist and nationalist movements in the East.