When people get involved in genealogy, a lot of them will eventually become interested in lineage societies. What are lineage societies? They are clubs, groups, and organizations that you are allowed to join (or not) based on your ancestry. For example, Daughters of the American Revolution (one of the better known lineage societies) accepts applications for membership from women who can prove they are descended from someone
who fought or provided assistance to the colonial cause in the American Revolution.
The General Society of Mayflower Descendants is open to anyone who can prove they are the direct descendant of someone who traveled to America on the Mayflower. There are lineage societies for all kinds of things, such as societies for people who are descended from Civil War soldiers, War of 1812 soldiers, colonial immigrants, people involved in the
Salem witch trials, people who were among the first colonists of Jamestown, and societies for people with royal ancestry. The list of potential lineage societies you could join is very long, indeed...