Language: Arabic unites the Arab world. Spanish unites the Hispanic.
                  Brazil is the only South American nation which does not speak Spanish. It speaks Portuguese.
                  Canada is bilingual nation. French and English.
                  Switzerland - multiple languages - little conflict between the groups.
                  English is now world language which is used for most business transactions around the                       world.

Ethnic Heritage: In Yugoslavia, many ethnic groups were made into one country(Serbs, Croats,                                      Bosnians, Albanians). When strong leadership died out, different groups fought civil                            war and separate into countries.

                           In Rwanda and Barandi in Africa, two ethnic groups are dominant, the Tutsis and the                            Hutus. They have own power, persecute each other.

                           US and Switzerland have peacefully merged multiple ethnic groups.
                           Korea and Japan have primarily one ethnic group.
                           On the island of  Cyprus, the Greeks and the Turks try to gain control.