The unresolved border conflict with Bolivia over the Chaco region finally erupted in the early 1930s in the Chaco War. After great losses Paraguay defeated Bolivia and established its sovereignty over most of the disputed Chaco region. After the war, military officers used popular dissatisfaction with the Liberal politicians to seize the power for themselves. On 17 February 1936, the February Revolution brought colonel Rafael Franco to power. Between 1940 and 1948, the country was ruled by general Higinio Mornigo. Dissatisfaction with his rule resulted in the Paraguayan civil war of 1947.[37] In its aftermath Alfredo Stroessner, began involvement in a string of plots, which resulted in his military coup d'tat of 4 May 1954. In the aftermath of World War II, Paraguay became a hideout for Nazi fugitives accused of war crimes.