| Country | Action | Action Date | Effective Date |
|---|
| BAHAMAS | Accession | 30/12/1943 | |
| BRAZIL | Signature | 13/12/1937 | |
| BRAZIL | Ratification | 29/11/1939 | |
| BRAZIL | Reservation | 29/11/1939 | |
| CANADA | Signature | 13/12/1937 | |
| CANADA | Ratification | 22/12/1938 | |
| CHILE | Signature | 13/12/1937 | |
| COLOMBIA | Signature | 13/12/1937 | |
| CUBA | Signature | 13/12/1937 | |
| CUBA | Ratification | 12/01/1938 | |
| DOMINICAN REPUBLIC | Signature | 13/12/1937 | |
| DOMINICAN REPUBLIC | Ratification | 27/10/1938 | |
| GUATEMALA | Signature | 13/12/1937 | |
| HAYTI | Signature | 13/12/1937 | |
| HAYTI | Ratification | 27/06/1938 | |
| MEXICO | Signature | 13/12/1937 | |
| MEXICO | Ratification | 17/04/1939 | |
| NICARAGUA | Signature | 13/12/1937 | |
| PANAMA | Signature | 13/12/1937 | |
| PANAMA | Ratification | 06/02/1939 | |
| PARAGUAY | Accession | 01/07/1938 | |
| PERU | Signature | 13/12/1937 | |
| PERU | Ratification | 19/12/1938 | |
| UNITED KINGDOM | | | |
| UNITED STATES OF AMERICA | Signature | 13/12/1937 | |
| UNITED STATES OF AMERICA | Ratification | 21/07/1938 | |
| URUGUAY | Signature | 13/12/1937 | |
| VENEZUELA | Signature | 13/12/1937 | |