Puerto Rico
Puerto Rico has about 3.3 million (3,300,000) people. Its political system is based on a republican system. It has two official languages: Spanish and English, but Spanish is almost only used by the government, the legislature and the judiciary (courts). Spanish is also the main language of the school curriculum, though English is taught in all schools as a second language (from grade 1 to 12). Puerto Rico is one of two U.S. territories where the metric system is officially used and is dominant. (The other is Guam, which was also a Spanish colony. The metric system was introduced to both territories, before they became U.S. territories.) Spanish is spoken by 94.7% of the population and English is spoken by 5.3% of the population as a mother language. The currency used is the United States dollar.