Answer:
Approximately 51 million people died in the European theater during World War II.
Step-by-step explanation:
Europe was the main theater of operations of World War II. It was opened with the invasion of Poland on September 1, 1939 and closed with the unconditional surrender of Germany to the United Kingdom, the United States, France and the Soviet Union on May 8, 1945.
The important European theater of operations included three fronts of operations: the Mediterranean Front, the Western Front and the Eastern Front. The combined total deaths of these fronts was approximately of 51 million, taking into account both military and civilian deaths.