separatistic

/ˌsɛpərəˈtɪstɪk/
adjective
  1. Relating to or advocating for separation, especially political or cultural separation from a larger group.
    • The party's separatistic platform called for the region to become an independent country.
    • The artist's work had a separatistic theme, emphasizing the unique identity of her community.
    • Some historians view the movement as more separatistic than reformist.