Eleven years after Massachusetts became the first state to allow same-sex couples to marry, the Supreme Court on April 28 will hear arguments about whether to extend that right nationwide. The case comes amid a wave of gay marriage legalization: 28 states since 2013, and 36 overall. Such widespread acceptance in a short amount of time isn’t a phenomenon unique to gay marriage. Social change in the U.S. appears to follow a pattern: A few pioneer states get out front before the others, and then a key event—often a court decision or a grassroots campaign reaching maturity—triggers a rush of state activity that ultimately leads to a change in federal law.
We looked at six big issues—interracial marriage, prohibition, women’s suffrage, abortion, same-sex marriage, and recreational marijuana — to show how this has happened in the past, and may again in the very near future.