Pan-American Highway development across Central America (1923–1974)

1. Fifth International Conference backs highway concept

   May 1, 1923Labels: Fifth International, Pan-American concept

   • Britannica
   • TIME

2. Buenos Aires hosts first major highway congress

   Oct 3, 1925Labels: Buenos Aires, Pan American

   • FHWA
   • LOC

3. Panama meeting creates Inter-American Highway Commission

   Oct 1, 1929Labels: Inter-American Highway, Panama meeting

   • State Dept
   • Foreign Affairs

4. Route reconnaissance and commission work intensify

   Mar 16, 1931Labels: Route reconnaissance, Engineers surveys

   • LOC
   • State Dept

5. Inter-American Highway program formally initiated

   Jan 1, 1932Labels: Inter-American Highway, Bureau of

   • FHWA

6. Convention on the Pan American Highway adopted

   Dec 23, 1936Labels: Pan-American Convention, Hemispheric agreement

   • OAS
   • Britannica

7. Convention enters into force

   Jul 29, 1937Labels: Convention in, Signatory states

   • OAS
   • Britannica

8. U.S. begins Costa Rica–Panama link amid wartime fears

   Jan 1, 1941Labels: U S, Costa Rica

   • Britannica
   • Wikipedia

9. Mexico completes its national section

   Jan 1, 1950Labels: Mexico national, Mexican completion

   • Britannica
   • LOC

10. Central American route opens to through traffic

    Jan 1, 1963Labels: Central American, U S

    • LOC
    • Britannica

11. U.S. ends long-term highway construction role in Panama

    Jun 9, 1967Labels: Panama paving, U S

    • FHWA
    • FHWA

12. Inter-American Highway program declared accomplished

    Dec 31, 1967Labels: Program accomplished, Inter-American completion

    • FHWA
    • Wikipedia

13. Darién Gap remains the unresolved international break

    Jan 1, 1974Labels: Dari n, Indigenous opposition

    • Britannica
    • Wikipedia