The early 20th century saw this battle between U.S. and Mexican border officials amidst rising tensions.
Answer Battle of Ambos Nogales
The Mexican-American border saw increased military presence as early as the 20th century. Rising tensions between Mexican troops and bandits and U.S. troops along the border led to the Battle of Nogales, a border town with both U.S. and Mexican residents. Although the battle was short-lived and ended in a ceasefire, there was a large body count on both sides.
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