most of us gain our sense of belonging through a variety of groups we interact with on a daily or weekly basis — our families, friends, colleagues, sports teams or groups based around other hobbies and interests. But in addition to these groups that we experience in person through shared activities, we all have larger-group affiliations, which can vary in strength from one person to another. These can include our country of birth or residence, a political party, a wider religious group that includes people from other countries and cultures, an ethnicity, a language group or an identity based on shared passions, such as being a music or sports fan. There are many parts to a typical identity, but sometimes, if rarely, one comes to dominate above all others, leading to specific psychological states and associated behaviors, including violence.