The United States-Tijuana border was established by the Treaty of Guadalupe Hidalgo as a line beginning three miles south of the San Diego Bay. In 1864 the first Mexican customs offices opened in Tijuana due to a large boom in population. The San Ysidro border yields the highest point of crossing in the world. One third of daily border crossings are made by US-citizens. The border is full of stories both noble and nefarious as lives mesh together in this small stretch of land.
