Why did roman start fighting Celts?

The Romans began fighting the Celts primarily to expand their territory and influence in Europe. The Celtic tribes presented a threat to Roman trade routes and stability in the region, prompting military campaigns to subdue them. Additionally, the conquest of Celtic lands was seen as a means to gain resources and wealth, further enhancing Rome's power. The most notable conflicts occurred during the Gallic Wars led by Julius Caesar in the 1st century BCE.