Tell The Wind and Fire by Sarah Rees Brennan

In this future New York, the city is divided in two: Light vs Dark. Only Light Magicians can live in and access the wealthy, upper-class life. The Dark Magicians are banished to the Dark, to carve out lives in poverty under harsh rule imposed by the Light leadership.

Lucie and her father escaped the dark at a high price. Now Lucie survives at the mercy of friends and by burying her past as deeply as she can. Only, the people in the Dark don’t want her to forget. They’ve made her name a rallying cry to a revolution that could destroy the new life Lucie has fought so hard to create and the boy she loves more than anything.