Question

while year world war 1 and 2 started​

Answer 1

Answer:

The term is usually reserved for two major international conflicts that occurred during the first half of the 20th century: World War I (1914–1918) and World War II (1939–1945).

Explanation:

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Answer 2

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World War I (1914–1918) and World War II (1939–1945)