United States of Anarchy is the contemporary world created by Caroline Peckham and Susanne Valenti. This world does have characters that appear in other series within the world. This is a recommended reading order
Brutal Boys of Everlake Prep
Dead Men Walking Duet
Due to the overlap of timelines it is recommended to read the series within this world in this order.
Characters from the series do make appearances in the series that follow them.