Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Whale Sanctuary of El Vizcaino' has mentioned 'United States' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| The first applicable conservation effort is the Convention for the Protection of Migratory Birds and Game Mammals, a bilateral agreement between Mexico and the United States of America ratified in 1937. | UNESCO |