A history of the San Diego-Mexico border region in the Little
San Diego-Tijuana Border Crossing Opens to North America's Future - Bloomberg
US-Mexico Border Map Shows How Hard It Would Be to Build a Border Wall
Friendship Park – San Diego, California - Atlas Obscura
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Unity, division marks San Diego-Tijuana border history - The San Diego Union-Tribune
Mexico–United States border - Wikipedia
Myth and Reason on the Mexican Border, Travel
How San Diego Built a Bridge Over the Wall - POLITICO Magazine
San Diego–Tijuana - Wikipedia
Where Does Illegal Immigration Mostly Occur? Here's What The Data Tell Us : NPR
History of San Ysidro, Mexico Insurance Services
Two Cities, Two Countries, Common Ground - The New York Times
Your Guide to Crossing the San Ysidro Border
Name One State That Borders Mexico - Constitution of the United States
US-Mexico immigration: Even oceans have borders - BBC News
