When Ken and I were born the earth sustained about 2.3 billion people. I remember in high school when the population of earth topped 3 billion. Wow! Now 7.8 billion people occupy our planet. We get along and get ahead via politics. For the most part, we do politics in our communities. We politic when we communicate, socialize, organize, and express our expectations. We shape our friends' mental models, accommodate their worldviews, and meet their needs while talking about shared priorities.
Each of us belongs to several communities, some geographic, some specialized, some social, some online. A community is any group with which you communicate regularly and share priorities. In your town or city, you share a desire for good roads, schools, and trash collection. You may work to pass a bond issue, or elect a member of the school board. In a neighborhood, you share a desire for personal safety and green space. You may lobby for more street lights or participate in neighborhood watch. In a faith community, you share priorites for adequate facilities and sympathetic outreach.