US-Mexico border explained: guide to understanding migrant hot spots

America is facing the 'worst border security crisis' in its history - with states from Texas to New York close to their breaking points amid a surge in migrant crossings.

But the busiest border flashpoints can change overnight - and as fast as one area is contained, a new 'ground zero' crops up.

Since the beginning of the year, hot zones that had been the epicenters of the , have quieted down - with traffic instead ramping up in and .

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