Which of the following wars took place in the twentieth century: World War II, American Revolution, French Revolution, Hundred Years War, and the Vietnam War?
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which of the following wars took place in the twentieth century: World War II, American Revolution, French Revolution, Hundred Years War, and the Vietnam War?

### Response:

World War II and the Vietnam war took place in the twentieth century.