Final answer:
The U.S. border region thought to be the home of the chimichangas is Sonora, closely associated with Arizona due to its significant Hispanic population and shared cultural heritage.
Step-by-step explanation:
The U.S. border region thought to be the home of chimichangas is Sonora.
This region, part of the American Southwest including areas such as Arizona and adjacent to the state of Sonora in Mexico, has a strong Hispanic heritage.
The Hispanic or Latino population in areas like New Mexico, Texas, and Arizona contributes significantly to the cultural and culinary landscape, including the creation and popularity of foods like chimichangas.
While there are competing stories about the exact origin, the consensus often points to the Sonora area, which lies in close proximity to Arizona.