On a sunny day last week, a group of American teen-agers marched up and raised a U.S. flag over their high school at Balboa in the Panama Canal Zone. It seemed an everyday thing to do. But in the ...

Following pressure from anti-colonial movements, the U.S. signed treaties in 1977 granting Panama control and full sovereignty over the canal zone and ... the ports of Balboa and Cristobal at ...