Final answer:
Fidel Castro seized power in Cuba through public support, especially from the poor, his promises of land redistribution, and the ousting of U.S. economic influence. The successful Cuban Revolution against the Batista regime was facilitated by Castro's 26th of July Movement, his appeal to worker conditions, and the general discontent with Batista's corrupt leadership.
Step-by-step explanation:
The factor that helped enable Fidel Castro to seize power in Cuba was a combination of public support, particularly from the poor, advocating land redistribution and the removal of U.S. influence on the island's economy. Castro and his rebel forces, which included his brother Raúl and revolutionary Che Guevara, initiated the Cuban Revolution against the oppressive and US-backed Fulgencio Batista regime. Starting in the Sierra Maestra and continuing countrywide, Castro's promise of reform, his implementation of wealth redistribution plans, and his exploitation of nationalist sentiment were key factors in the success of the revolution. Additionally, his nationalization of land and industries, which appealed to landless farmers and those exploited by foreign companies, significantly bolstered his support amongst the Cuban populace. The 26th of July Movement, Castro's promise to address worker conditions and fulfill democratic principles, and the growing discontent with Batista's repressive and corrupt government underpinned Castro's rise to power. The dissatisfaction of the Cuban people with Batista's regime created an environment ripe for revolution, and Castro's strategic alliances and revolutionary ideology enabled him to capitalize on this opportunity to successfully overthrow Batista and establish his leadership in Cuba.