There are those who are Globalists and feel that through education, intermarriage, improved economics, religion, etc., the people of the earth can become one big happy family. There are others who believe that is impossible because people are tribal and want to protect their culture, traditions, property from other peoples they consider inferior.  There doesn’t appear to be any evidence to support the globalists anywhere in history, however there is no shortage of evidence that all people are Tribalists.