Jose Maria Guido

After the military coup that ousted President Arturo Frondizi, the armed forces appointed Guido, then President of the Senate, as president. He served as a civilian figurehead while the military retained actual power.

Guido, under military pressure, annulled the results of the 1962 legislative and gubernatorial elections that had seen Peronist victories. This action deepened political instability and alienated Peronist supporters.

Guido's administration oversaw a military crackdown on Peronist and leftist groups, including the banning of political parties and the arrest of opposition leaders. This period saw increased state violence and censorship.

Guido oversaw the transition to civilian rule after the 1963 elections, handing power to President-elect Arturo Illia. This marked the end of the military interregnum and a return to constitutional government.