United States
| Legal system family | Common law + Civil law |
| How the law works | Federal courts and 49 states use the legal system based on English common law, which has diverged somewhat since the mid-nineteenth century in that they look to each other's cases for guidance on issues of the first impression and rarely, if ever, look at contemporary cases on the same issue in the UK or the Commonwealth. Louisiana is based on French and Spanish civil law, and Puerto Rico is based on Spanish civil law. |
| Form of government | democratic republic; constitutional republic |
| Constitution | United States Constitution |
| Legislature | United States Congress |
| Highest court | Supreme Court of the United States |
| Head of state | Donald Trump |
| Head of government | Donald Trump |
| Age of majority | – |
| Minimum marriage age | – |
| Retirement age | 66 |
| Official languages | Spanish; Carolinian; Chamorro; Hawaiian; Samoan |
| Capital | Washington, D.C. |
| Continent | North America |
| Population | 340,110,988 |
Wikipedia: law of United States ↗ · Wikidata ↗