The dominoes originated in Spain before spreading throughout the Spanish-speaking world.
The answer to the question is "México and Cuba." Dominoes originated in China, during the Song Dynasty in the 12th century. They were later brought to Europe in the 18th century and eventually reached the Spanish-speaking world through Spanish colonies, particularly México and Cuba. To find the answer to this question, you could have researched the history of dominoes, tracing their origins and their spread throughout different regions. This might involve looking up historical records, scholarly articles, or consulting reputable sources on the subject.