The world's longest road

The transcontinental highway was first proposed by the United States in 1923 at the 5th International Conference of the American States. However, it wasn't until 1937 that a new convention was signed by 14 countries: the United States, Canada, Mexico, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, Panama, Colombia, Ecuador, Peru, Chile, and Argentina. The first section in Mexico was completed in the 1950s.

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