The human experience is driven by the desire for intimacy through interpersonal relationships, and one group in which this desire comes to fruition is the legally binding union of marriage. Through a literature review on the history of marriage, it is evident that the primary motivator for people to marry has changed over time, making the structure of marriage an evolving relationship on a societal and personal level. Shifting from economics to social class to religion, the motivating need for marriage in Western, 21st century society has now become a desire for happiness. Given this, this project is a synthesis of different psychological and sociological theories and studies that provide the key correlates of marriage satisfaction within individual differences, relational processes, and external context. Being happy together within a legally binding relationship is not always an easy task, but with the right knowledge on what truly correlates towards higher marital satisfaction, it is possible for couples to learn what can help them thrive.