This document summarizes the transnational trend of granting same-sex marriage rights. It discusses how same-sex marriage legislation has spread rapidly across many countries in a short time period. The document analyzes factors driving this convergence, including the framing of same-sex marriage as a human rights issue and the actions of LGBT social movements. It provides an overview of the current state of same-sex marriage and LGBT rights internationally, and examines theories that may explain the nature and speed of this social change.