The Pacific Storm Conflict

In 2029, an alien vessel lands on earth, making a new era with world governments and aliens from 40500 light years away. Four years later, the aliens sent a message, with the simple request of letting refugees into the planet. With a brutal civil war in an alien moon, refugees came in by the millions, making tent cities all over the American west coast, where the aliens and humans agreed to station refugees. However, every day, tension rises between the aliens and human civilians, as incidents occur between them...

There is some aspect of bloody stuff in this book, but nothing too far... just watch out.