By the 1880s the Brazilian Imperial Navy was the most powerful in South America. After the 1893–1894 naval rebellion, there was a hiatus in the development of the navy until 1905, when Brazil acquired two of the most powerful and advanced dreadnoughts of the day which sparked a dreadnought race with Brazil's South American neighbours. The Brazilian Navy participated in both World War I and World War II, engaging in anti-submarine patrols in the Atlantic.