Cultural diversity is often attributed to groups in a society from a variety of cultural backgrounds. Assimilation then blends subcultures into a mainstream culture. However, history and circumstance give rise to new groups whose experiences and activities produce new diversity. Big events and big changes give rise to important differences between groups. Popular culture brings new subcultures to the attention of the mainstream. Examples are "The Grapes of Wrath", "The Best Years of Our Lives", and "The Company Men", discussed as a step in bringing awareness of current unemployment issues.