Question: Are both buildings, Centro Internacional De Convenciones De La Ciudad De Madrid and United States Post Office-Langdon, located in the same country?
Sentence (from "United States Post Office-Langdon"): The U.S. Post Office- Langdon, also known as Langdon Post Office, in Langdon, North Dakota, United States, is a post office building that was built in 1937.
Relevant evidence: Yes