What are the three most important rivers in Southwest Asia? Why are they so important?

I would say the Tigris, Euphrates, and the Indus River (though some might argue that the Jordan River was more important).

The Tigris and Euphrates provided Mesopotamia with water and soil, allowing them to develop agriculture using irrigation.

The Indus River also provided water and food resources.

the roman republic began to expand when rome fought the punic wars and defeated carthage. the punic wars refer to the series of 3 wars fought among rome and carthage, before it ended in carthage's defeat.