The Hermosa native said her platform of advocating for minorities and disadvantaged communities stems from her background and upbringing.
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She's part of the Hermosa Neighborhood Association, which helps minorities get into the workforce and promotes education.
She was only the second Latina in state history to win her title.
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"I'm just grateful to represent my state," Reyes said.
Reyes is now preparing to compete for Miss USA this fall, hoping to represent the country at the Miss Universe Pageant.
She's gone for the Miss Illinois USA crown five times, and said the fifth time's the charm.