Generate a question that has the following answer: 1928. for the following movie plot: The story of Antonieta Rivas Mercado is told by a modern French psychologist who is intrigued by Antonieta's history and comes to Mexico to learn more about her and the Mexican fascination with death. The film is set during one of the bloodiest eras of Mexican history and contains some very interesting archival footage of the Revolucion.Antonieta's father designed the Independence Monument, always known as El Angel, and she is generally believed to have modeled for the angel which fell during the earthquake of 1957. She inherited a fortune when her father died in 1925. She was briefly married and had a son who later married an American woman who published a biography of Antonieta, Under the Shadow of the Angel.In 1928 President Obregon was assassinated in Guanajuato. A popular former education minister, Jose Vasconcellos, launched a campaign for the presidency. Antonieta used her money to support the campaign and became his lover.Vasconcellos lost the election and went into Parisian exile and in1931 Antonieta followed him. She asked Vasconcelos if he needed her and, when he said he did not, used his gun to commit suicide in the Cathedral of Notre Dame.
Answer:
What year was president Obregn assasinated?