You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Russian_Soviet_Federative_Socialist_Republic

Context:
The final name for the republic during the Soviet era was adopted by the Russian Constitution of 1937, which renamed it the Russian Soviet Federative Socialist Republic.

Question:
What document changed the name of Russia in 1937?

the Russian Constitution of 1937