subjection       
noun [ U ] uk/səbˈdʒek.ʃən/ us/səbˈdʒek.ʃən/
 被(他国)征服
the state of being under the political control of another country or state
  The book discusses the political subjection of the island by its larger neighbour. 这本书谈论了该岛在政治上受到其强大邻国控制的问题。