The border stretches from the Gulf of Mexico to the Pacific Ocean and includes eco-regions like desert scrub, forest woodlands, and wetland marshes. Here's how a wall could affect one of the most sensitive landscapes in North America.

The border stretches from the Gulf of Mexico to the Pacific Ocean and includes eco-regions like desert scrub, forest woodlands, and wetland marshes. Here's how a wall could affect one of the most sensitive landscapes in North America.