Many reasons I'm sure. Some might have been born near the border and never left. Some Mexicans might try to profit from the tourism industry near their town. I'm sure the population is proportionate to other areas away from the border. Many Americans also live near that same border and like the Mexicans they may be seeking out jobs.
near the border
Mexicans didn't cross the border, the border crossed them.
Most Mexicans live geographically in the central plateau because when the first emigrants crossed the border they settled closely by in Arizona, Texas and New Mexico. Later they migrated northward.
swimming
People may live near the US border for various reasons such as job opportunities, family connections, cultural ties, or simply proximity to services and amenities available in the US. Economic factors and the ease of crossing the border for work or leisure could also play a role in people's decision to live near the US border.
The majority of Pakistanis live on or near the Pakistan-India border.
they swam across the border
Mexicans - South of the Border
Mexico's poorer population is located near the border. Near it has a lot of easy jobs involving farming in the US. They grab all their things, do everything they can to support their family and jump the border. That is why Mexican hobos are awesome! Unlike other hobos, these don't sit and beg, they jump the border!
On or very near the US and Mexico border.
there are 5 guards on the border that's how so many Mexicans get through
The idea is to keep Mexicans from crossing the border into the US.