In what city did the Salvadorian model born on August 4, 1994 win the Miss Universe pageant?
Las Vegas, Nevada
Title: Miss Universe Thailand
Passage: The Miss Universe Thailand (Thai: มิสยูนิเวิร์สไทยแลนด์) is a beauty pageant that has been held every year since 2000.  The pageant was originally called Miss Thailand Universe.  In 2012 name of the pageant was changed to Miss Universe Thailand, with winners competing in the Miss Universe pageant.  Accordingly, "Miss Universe Thailand" is not related to the previous franchises of Miss Thailand or Miss Thailand World.
Title: Miss Universe 2015
Passage: Miss Universe 2015, the 64th Miss Universe pageant, was held on 20 December 2015 at The AXIS in Las Vegas, Nevada, United States.  Paulina Vega of Colombia crowned her successor Pia Wurtzbach of the Philippines at the end of the event.  80 contestants competed for the crown.
Title: Idubina Rivas
Passage: Fátima Idubina Rivas Opico (born in August 4, 1994) is a Salvadorian model and beauty pageant titleholder who was appointed Miss Universe El Salvador 2015 and the winner of Reinado de El Salvador in 2013.  She represented her country at the Miss Universe 2015 pageant.
Miss Universe 2015 Idubina Rivas