The neutrality of the nearly 50-mile canal, through which nearly 15,000 ships transit each year, is enshrined in Panama’s Constitution and is enforced by the autonomous Panama Canal Authority.

Marco Rubio will travel to Panama on his first trip abroad as secretary of State. The visit comes as Donald Trump looks to reclaim Panama's canal.

Flags across Arizona returned to half-staff on Tuesday after flying at full-staff on Monday. Here's why they've been at half-staff for so long.