"Alta," which means "higher" in Spanish, and "Baja" California, or "lower," were once one territory. In the 19th century, the vast area was governed first by Spain and then by Mexico.
The FBI is still investigating whether the agents were attacked or if they fell into the culvert, but the incident reignited debate over border security.
As the U.S. bishops were beginning their fall assembly in Baltimore, also marking their 100th anniversary as a conference, a couple of nonviolent protesters gathered nearby.