On Wednesday, Ecuador's highest court legalized same-sex marriage. The decision came amid a wave of successes for LGBTQ rights: On Tuesday, Botswana's high court decriminalized homosexuality and, last month, Taiwan became the first nation in Asia to legalize same-sex marriage.

But recognition of same-sex marriage is not equitably distributed across the world. According to the Pew Research Center, about two-thirds of the countries that legally recognize same-sex marriage are in Western Europe. In the Asia-Pacific region, only New Zealand, Australia, and Taiwan allow same-sex couples to wed. South Africa remains the only country on the African continent that allows same-sex unions. And in the Americas, only Argentina, Brazil, Canada, Colombia, Uruguay, and the United States allow same-sex marriage (although some local jurisdictions in Mexico legally recognize gay marriage).

While 2019 has already seen significant victories for LGBTQ rights, same-sex marriage remains illegal in most countries around the world: As of May of 2019, the Pew Research Center reported that 29 countries legally recognize gay marriage (that number is now 30 when including Ecuador).

Homophobia remains a pervasive issue in countries across the world, including places where gay marriage is legal. But giving same-sex couples legal recognition—which, in many cases, also allows them to access certain other benefits from the state generally awarded to married couples—may actually be a useful tool to change social attitudes and bias toward queer people.

According to a study published in April of 2019 in the journal Proceedings of the National Academy of Sciences, legalizing same-sex marriage reduces anti-gay bias. In order to measure societal attitudes about same-sex marriage, the researchers analyzed the conscious and unconscious thoughts on contemporary issues of roughly one million individuals who visited the Project Implicit website between 2006 and 2016.

The team also analyzed additional data on more than 10,000 respondents on their opinions of gays and lesbians during the American National Elections Studies in 2008, 2012, and 2016, allowing researchers to collect opinions of Americans across the country as same-sex marriage legislation was incrementally introduced. Read more via Pacific Standard