Why does percy send medusa head to mount olympus?

In the real greek mythology perciuos sends it not percy he send it as a victory prize but zues later throw it down in to the ocean 

The war began as a fight between mayans and the landowners of the country. the main causes of the guatemalan civil war was started by the greed of the united fruit company, the fear of communism, and the racism toward the  mayan  people.