Final answer:
Ethiopia, an ancient kingdom, maintained a distinctive language and culture with Christian and Jewish communities despite its dependence on trade.
Step-by-step explanation:
The country in ancient kingdoms that maintained a distinctive language and culture including Christian and Jewish communities despite its dependence on trade is Ethiopia.
Ethiopia combined traditional Jewish traditions with Christianity and had its own unique language and culture. Its rulers were believed to be descendants of the Queen of Sheba and King Solomon. Ethiopia has a long history as a powerful Christian kingdom and the Ethiopian church follows the Coptic liturgy.