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Julio Betancourt
New doubt is cast on comet as big-animal killer
An international team of geologists has cast further doubt on a 2007 study that claimed a comet was responsible for the disappearance of the giant mammals that once roamed Arizona and the people who hunted them.
Flow of Anglos had reshaped the city by statehood
Tucson was born Spanish and raised Mexican - but by the time it joined the Union in 1912, it was well on its way to being a thoroughly American and mostly Anglo town.
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