In the aftermath of Dom Pedro I's abdication in 1831, a regency created to govern Brazil during the minority of the former Emperor's son, Dom Pedro II, soon dissolved into chaos. Paraná formed a political party in 1837 that became known as the Reactionary Party, which evolved into the Party of Order in the early 1840s and in the mid-1850s into the Conservative Party. He and his party's stalwart and unconditional defence of constitutional order allowed the country to move beyond a regency plagued by factious disputes and rebellions that might easily have led to a dictatorship. Appointed president of Rio de Janeiro Province in 1841, Paraná helped put down a rebellion headed by the opposition Liberal Party the following year. Also in 1842, he was elected senator for Minas Gerais and appointed by Pedro II to the Council of State. In 1843, he became the "de facto" first president (prime minister) of the Council of Ministers, but resigned after a quarrel with the Emperor.