What country joined World War I in 1917 after the United States entered the war?
Answer: Romania
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Generate a historical trivia question about the following topic.

### Input:
Topic: World War I

### Response:
What country joined World War I in 1917 after the United States entered the war?
Answer: Romania
assistant

Here's a historical trivia question about World War I:

What was the name of the German military tactic in which infantry units formed a dense, shield wall to protect themselves from machine gun fire, while cavalry charges were used to attack the enemy flank, creating a "wall" of soldiers that would ultimately pin down the enemy?

A) Blitzkrieg
B) Phoney War
C) Defensive positions
D) Tank maneuver