Cross-national research assessed individuals from different countries, such as the United States, the United Kingdom, China, Korea, and Mexico, and analyzed a significant amount of information. Its findings conclusively revealed that unmarried people are prone to depressive symptoms. This large, cross-cultural study provided an understanding of how depression relates to marriage. https://www.psychologs.com/unmarried-and-unhappy-what-science-says-about-singles-and-depression/