for some they started to see how unfair it was but for others it showed them why they "needed" slaves.
Napoleon had invaded Spain proving how weak it was, leading country's to revolt after years of discontent.
Answer:
An arms race occurs when two or more countries increase the size and quality of military resources to gain military and political superiority over one another. The Cold War between the United States and the Soviet Union is perhaps the largest and most expensive arms race in history; however, others have occurred, often with dire consequences.
Explanation: