offee production. All levels of education collapsed; the university was shut down, as it was starved both of resources and students, with young Dominican men from 16 to 25 years old being drafted into the Haitian army. Boyer's occupation troops, who were largely Dominicans, were unpaid, and had to "forage and sack" from Dominican civilians. Haiti imposed a "heavy tribute" on the Dominican people. Many whites fled Santo Domingo for Puerto Rico and Cuba (both still under Spanish rule), Venezuela, and elsewhere. In the end the economy faltered and taxation became more onerous. Rebellions occurred even by Dominican freedmen, while Dominicans and Haitians worked together to oust Boyer from power. Anti-Haitian movements of several kinds – pro-independence, pro-Spanish, pro-French, pro-British, pro-United States – gathered force following the overthrow of Boyer in 1843.
In 1838 Juan Pablo Duarte founded a secret society called La Trinitaria, which sought the complete independence of Santo Domingo without any foreign intervention. Matías Ramón Mella and Francisco del Rosario Sánchez, despite not being among the founding members of La Trinitaria, were decisive in the fight for independence. Duarte, Mella, and Sánchez are considered the three Founding Fathers of the Dominican Republic. On February 27, 1844, the Trinitarios (the members of La Trinitaria), declared the independence from Haiti. They were backed by Pedro Santana, a wealthy cattle rancher from El Seibo, who became general of the army of the nascent Republic. The Dominican Republic's first Constitution was adopted on November 6, 1844, and was modeled after the United States Constitution.
The decades that followed were filled with tyranny, factionalism, economic difficulties, rapid changes of government, and exile for political opponents. Threatening the nation's independence were renewed Haitian invasions occurring in 1844, 1845–49, 1849–55, and 1855–56