The correct answer is México. Diego Rivera was a famous Mexican artist known for his large murals depicting social and political themes. To find the answer to this question, you could have done a simple online search by typing "Diego Rivera nationality" or "Where was Diego Rivera from?" This would have led you to various reliable sources such as biographies, articles, or encyclopedic entries that provide the answer. Remember, using search engines and trusted sources is a great way to find information and learn about different topics.