Mother Teresa's marital status was single. This is because she was a sister (nun) and nun's are not allowed to get married, as they are essentially supposed to devote their lives to the church. Mother Teresa was a Roman Catholic religious sister and missionary who spent most of her life in India where she ran a number of charitable institutions.
They are like not of these. Cossacks are part of the former Russian army.
Cultural Assimilation or Acculturation is the act of adopting new cultures to come and replace the old one