To what extent do shared stories among a group of peoples affect their perspectives and nationalism and form a group identity?

Social Studies 20-1 essay on how shared stories affect a groups ideas of nationalism and group identity. The essay can talk about any group of peoples like Aboriginals, Francophones, the people of France during the French Revolution ect, but must include 3 seperate groups and explain how their hardhsips and experiences have affected their cultures, and ideas of nationalism.