Title: Economy of Puerto Rico
Content:  Puerto Rico does not have a local coin, using instead the United States dollar as its only currency. Because of this, Puerto Rico controls neither its money supply nor its interest rates, being subject instead to the monetary policy of the United States; particularly to the operations performed by the Federal Reserve System. Puerto Rico, however, has a representative in the Federal Reserve Bank of New York through a local businessman by the name of Richard Carrión, Chairman and CEO of Popular, Inc., who has served as member of the board for the reserve bank several times.
Title: Currencies of Puerto Rico
Content:   The currencies of Puerto Rico closely follow the historic development of Puerto Rico. As a Province of Spain (Autonomous Community) and a territory of the United States, Puerto Rico was granted the use of both foreign and provincial currencies. Following the Spanish colonization in 1502, Puerto Rico became an important port, with its own supply of gold. However, as the mineral reserves ran empty within the century, the archipelago's economy suffered. The Spanish Crown issued the Situado Mexicano, which meant that a semi-regular shipment of gold from the Viceroyalty of New Spain would be sent to the island, as a way to provide economic support. Between 1636 and 1637, Philip IV of Spain imposed a tax which had to be paid using a revenue stamp. Inspired by this, Puerto Rico 
Title: Currencies of Puerto Rico
Content:  provincial peso coins. On August 13, 1898, the Spanish–American War ended with Spain ceding Puerto Rico to the United States. The Banco Español de Puerto Rico was renamed Bank of Puerto Rico and issued bills equivalent to the United States dollar, creating the Puerto Rican dollar. In 1902, the First National Bank of Puerto Rico issued banknotes in a parallel manner. Two more series were issued until 1913. After Puerto Rico's economy and monetary system were fully integrated into the United States' economic and monetary system, the Puerto Rican dollars were redeemed for those issued by the United States Treasury. The peso and dollar have been followed by other contemporary issues, including commemorative banknotes, private currency, and a quarter coin designed with Fort San Felipe del Morro in the face.
Title: Currencies of Puerto Rico
Content:  in government and official entities, eventually allowing public distribution in 1881. However, some saw an opportunity for profit in this and bought Mexican pesos outside of Puerto Rico before importing them, in the process gaining a profit of up to 40 centavos per peso. In 1884, a number of different coins were countermarked with a fleur-de-lis for circulation on Puerto Rico. Spanish 2, 4 and 8 reales, and 5 and 10 centimos, United States' 20 cents, quarters, halves and dollars were all countermarked and used until they were redeemed in 1894. By 1895, the coins circulating in Puerto Rico were mostly Mexican silver, creating a shortage of currency. To resolve this, Spain issued a Royal Decree 
Title: Puerto Rico campaign
Content:  abolished in the island's schools and only English should be taught. Schools became the primary vehicle of Americanization, and initially all classes were taught in English, which also made for a large dropout rate. On January 15, 1899, the military government changed the name of Puerto Rico to Porto Rico (On May 17, 1932, U.S. Congress changed the name back to "Puerto Rico") and the island's currency was changed from the Puerto Rican peso to the American dollar, integrating the island's currency into the U.S. monetary system. The United States exerted its control over the economy of the island by prohibiting Puerto Rico from negotiating commercial treaties with other nations, from determining tariffs, and from shipping goods to the mainland on other than U.S. carriers.
Title: Isabel González
Content:  the right of citizenship — did not automatically apply, because the island belonged to the U.S., but was not part of the U.S. On January 15, 1899, the military government changed the name of Puerto Rico to Porto Rico (On May 17, 1932, the U.S. Congress changed the name back to "Puerto Rico") and the island's currency was changed from the Puerto Rican peso to the American dollar, integrating the island's currency into the U.S. monetary system. The United States exerted its control over the economy of the island by prohibiting Puerto Rico from negotiating commercial treaties with other nations, from determining tariffs, and from shipping goods to the mainland on other than U.S. carriers.
Title: Currencies of Puerto Rico
Content:  Due to its strategic location, currencies from several countries began circulating in Puerto Rico and used as trade. The government often ordered the collection of these coins in exchange for exchange notes. The first of these took place in 1857, when a royal decree ordered the gathering of macuquina coins. These arrived to Puerto Rico in 1813, originally produced by Spain in Venezuela. Due to Spanish manufacture, the exchange notes issued for the macuquina featured a 12.5% discount, which left a significant deficit in the government's budget. A decade later, coins were brought from the Dominican Republic to Puerto Rico. Consequently, the distribution of foreign coins received authorization. In 1879, the circulation of Mexican silver was 
Title: Currencies of Puerto Rico
Content:  used by the currency was changed from peso to dollars, giving birth to the Puerto Rican dollar. A proposal to print 1-dollar banknotes was suggested, but refused citing that it could "bring dangerous results". Series C bills were issued with a release date of "May 1, 1900" and were overstamped with "Moneda Americana" in bold red letters. They bore the signatures of the new bank governor Carlos María Soler and cashier Manuel Vicente. This marked the first and only time that currency valorized in dollars was issued outside the United States. Series E was introduced subsequently. The banknotes for this issue were bilingual, featuring 
Title: Currencies of Puerto Rico
Content:  The remaining exemplars of Puerto Rican currency have gathered significant value with the years, particularly in the United States. The value of them within the collectors of that country is due to the special nature of the post-1898 issues. Since they were issued under the same Spanish provincial charter, the Bureau of Engraving and Printing classifies them as "territorial" currency, this being the only unit of exchange of this kind that is recognized by the United States Department of the Treasury. Objects from Puerto Rico are constantly featured in specialized magazines, in both national and international distribution. The Puerto Rican dollars that were collected by the government, were burned between January 16–24, 1925, drastically reducing the amount of surviving 
Title: Currencies of Puerto Rico
Content:  fully integrated into the United States' currency system, while Puerto Rican dollars were redeemed for United States dollars. Banknotes valorized in millions continued in circulation, thus a collect was ordered and held between January 16 – 24, 1916. The remaining bills, with an estimated value of $14,872 were taken out of circulation nine years later by the Puerto Rico Commercial Bank. Parallel to the Bank of Puerto Rico, American investors saw an opportunity to establish banks in Puerto Rico. The first of these was the American Colonial Bank, which opened in 1899. The establishment of national banks was proposed to the Office of 

Question: what is the currency of puerto rico called?
Answer: United States dollar.