What is the causes of ethnicity?

Did Lewis and Clark travel through Wyoming? What were some beliefs of the Hopis? How rare are Sacagawea coins? Why did Pocahontas and her people greet the sun each morning? Group classification of dances found in the Philippines? Is Kings canyon the biggest canyon in Australia? What is the native American word for shadow? What beliefs did the Mojave tribe have? What is ethnicity of surname Robinson? Did the Inuit use every part of the animals they hunted? What caste is person with pidugu? Why did the Cheyenne live in teepees? Why do people wear 2 t shirts? Who were important people from Songhai? What caste is Vachani? Why don't the Navajo and the Anasazi get along? Which was the new dynasty formed by Babur? Large group of people that is noisy? What do the differing musical tastes of the greasers and the socs say about their gangs? What does lllawong mean in aboriginal?