Answer:
Fidel Castro wanted to overthrow Fulgencio Batista because he had made himself dictator which many people disapproved of and cancelled elections.
Explanation:
In the text it states,
"...made himself dictator. He canceled the 1952 elections of Congress. Many people in Cuba were disgusted and angered by his power grab. "
" One person who was angered by canceled elections and the loss of Cuban democracy was a rising political star, Fidel Castro. Castro would have probably won a seat in Congress had the 1952 elections taken place."
Fulgencio Batista cancelled elections. That made Fidel Castro lose his chance to win a seat in congress, which he was likely to get. That angered him. Fulgencio Batista had also made himself dictator, which many people disapproved of, so it made another great reason for Fidel Castro to want to overthrow him.