Timeline: Puerto Rico
Early U.S. Colonial Period (1900 – 1952)
The establishment of U.S. civilian government through the Foraker Act, imposition of U.S. citizenship through the Jones Act, the Insular Cases, Americanization campaigns, and the rise of the independence and labor movements.
10 events
Sugar Monoculture: How One Crop Destroyed an Economy (1900-1940)
After the 1898 invasion, American colonial policy deliberately transformed Puerto Rico from a diversified agricultural economy (coffee, tobacco, sugar, subsistence farming) into a sugar monoculture dominated by four American corporations — destroying food self-sufficiency, the Puerto Rican landowning class, and the island's economic independence.
Sources: 2
U.S. Military Use of Culebra
From 1901 to 1975, the U.S. Navy used the island of Culebra for military exercises, displacing residents and contaminating the environment before community resistance forced the Navy's departure.
Sources: 1
Culebra: Removal of a Community for Military Use (1901-1975)
The U.S. Navy used the island of Culebra for target practice and military exercises from 1901 to 1975, displacing residents, destroying land and marine ecosystems, and treating a Puerto Rican community as expendable — a precursor to the longer and more devastating occupation of Vieques.
Sources: 2
El Yunque National Forest: Colonial Control of Natural Resources
El Yunque — the only tropical rainforest in the U.S. National Forest System — was designated a federal reserve in 1903, placing Puerto Rico's most important ecosystem under federal control rather than Puerto Rican authority.
Sources: 2
The 1918 Influenza Pandemic in Puerto Rico
The 1918 influenza pandemic struck Puerto Rico with devastating force, killing an estimated 10,000 people — nearly 1% of the island's population — in just a few months. The colonial government's limited public health infrastructure, already strained by poverty and malnutrition, was overwhelmed, exposing the costs of colonial underdevelopment.
Sources: 2
The San Fermín Earthquake and Tsunami (1918)
A magnitude 7.1 earthquake struck western Puerto Rico on October 11, 1918, generating a tsunami that devastated coastal communities and killed 116 people.
Sources: 3
The School of Tropical Medicine and the Cornelius Rhoads Scandal (1926-1949)
A US-affiliated medical institution in Puerto Rico advanced tropical disease research while American physician Cornelius Rhoads wrote a letter in 1931 describing Puerto Ricans as subhuman and claiming to have injected patients with cancer cells.
Sources: 3
Hurricane San Felipe II (1928): The Storm That Broke the Coffee Economy
Hurricane San Felipe II struck Puerto Rico on September 13, 1928, as a Category 5 hurricane with winds exceeding 160 mph — killing approximately 300 people, leaving 500,000 homeless (half the population), and destroying the coffee industry that had been the economic backbone of the interior highlands. The storm permanently altered Puerto Rico's economic geography, accelerating the shift from coffee to sugar and from the mountains to the coast.
Sources: 2
Hurricane San Ciprián (1932)
Hurricane San Ciprián struck Puerto Rico on September 26, 1932, killing over 200 people and destroying 75,000 homes. Coming during the Great Depression and four years after Hurricane San Felipe II, the storm devastated the already-weakened coffee and tobacco economies and deepened Puerto Rico's dependency on federal relief.
Sources: 3
U.S. Navy occupies Vieques for weapons testing
The U.S. Navy expropriated two-thirds of Vieques island for weapons testing. For 62 years, the Navy dropped bombs containing napalm, depleted uranium, Agent Orange, and other toxic substances. Cancer rates in Vieques are 27% higher than mainland Puerto Rico.
Sources: 1