What methods did the Incas use to unify their large empire?

Write it like a kid wrote it

The Incas used different methods to bring all the people together in their big empire. They built a really good road system so people could travel between different places easily. They also made everyone follow the same rules, language, and religion. They had leaders who made sure everyone stayed peaceful and worked together. And they had big celebrations and festivals to bring everyone together and show the power of the empire.