For nearly 30 years, the governors of the states that line both sides of the United States-Mexico border have gathered to celebrate border bonhomie. They issue proclamations and pledges to work together, air grievances and concerns behind closed doors and pose for the cameras in symbolic showings of cooperation.

But this year the 28th annual conference has collided headlong with Arizona's crackdown on illegal immigration, inspiring bitter recriminations among Mexican governors and rancor among some American ones.

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