Final answer:
Carthage was the loser in the first Punic War. They had to give up their claims to Sicily and pay a war indemnity, but the Romans betrayed them and seized Corsica and Sardinia as well.
Step-by-step explanation:
In the first Punic War, the loser was Carthage. After suffering defeats, the Carthaginians sued for peace in 241 BCE and had to give up their claims to Sicily and pay a war indemnity. However, the Romans betrayed them and seized the islands of Corsica and Sardinia as well. This marked the end of the first Punic War and resulted in the Romans gaining control over Sicily and expanding their territory.