God's mission is not just to free the Israelites; he could have done that easily. He wants everyone to know who He is. And so, we will see 10 plagues. It is God showing his mighty hand to Israel, Egypt, and to the rest of the world. The first one hits Egypt in the one thing they depend on more than any other - the Nile. God may do the same to us if we have something we rely on more than him.
