Final answer:
The military coup in Chile on September 11, 1973, was led by General Augusto Pinochet, resulting in President Salvador Allende's death and leading to a military dictatorship.
Step-by-step explanation:
The military coup on September 11, 1973, in Chile was led by General Augusto Pinochet. Salvador Allende, backed by a socialist-communist coalition called Popular Unity, was the democratically elected president at the time. The overthrow resulted in Allende's death and thousands of his supporters. The coup was supported by the CIA as a part of its broader efforts to prevent the spread of communism in Latin America. Pinochet established a military dictatorship and ruled until 1990, during which he was known for the brutal repression of dissent.