Tensions between Portuguese and Brazilians increased, and the Portuguese Cortes, guided by the new political regime imposed by the 1820 Liberal Revolution, tried to re-establish Brazil as a colony. The Brazilians refused to yield, and Prince Pedro decided to stand with them, declaring the country's independence from Portugal on 7 September 1822. A month later, Prince Pedro was declared the first Emperor of Brazil, with the royal title of Dom Pedro I, resulting in the foundation of the Empire of Brazil.