Answer:
Until 1919, and from 1934 to 1952, Uruguay's political system, based on the 1830 Constitution, was presidential with a strong executive power, similar to that of the United States (but centralized and not federal).
The great war between the two parties broke out in 1839 and lasted until 1851. After this conflict, Uruguay joined Brazil and Argentina in a war against Paraguay from 1865 until 1870. From 1865 to 1958 the liberals retained power in Uruguay. One of the leaders, José Batlle y Ordóñez, impacted the country's history.