This morning, the Supreme Court handed down a historic decision, legalizing same-sex marriage nationwide. The ruling ends the ban on gay marriages in the 13 states where it was still illegal.

Delivering the majority opinion, Justice Anthony Kennedy wrote: "The right to marry is a fundamental right inherent in the liberty of the person, and under the Due Process and Equal Protection Clauses of the Fourteenth Amendment couples of the same-sex may not be deprived of that right and that liberty."

The opinion—which is worth a full read—continues:

From their beginning to their most recent page, the annals of human history reveal the transcendent importance of marriage. The lifelong union of a man and a woman always has promised nobility and dignity to all persons, without regard to their station in life. Marriage is sacred to those who live by their religions and offers unique fulfillment to those who find meaning in the secular realm. Its dynamic allows two people to find a life that could not be found alone, for a marriage becomes greater than just the two persons. Rising from the most basic human needs, marriage is essential to our most profound hopes and aspirations.

The centrality of marriage to the human condition makes it unsurprising that the institution has existed for millennia and across civilizations. Since the dawn of history, marriage has transformed strangers into relatives, binding families and societies together. 

...

The ancient origins of marriage confirm its centrality, but it has not stood in isolation from developments in law and society. The history of marriage is one of both continuity and change. That institution—even as confined to opposite-sex relations—has evolved over time. ... Indeed, changed understandings of marriage are characteristic of a Nation where new dimensions of freedom become apparent to new generations....

The road to marriage equality hasn't been easy. Check out this gif from mic.com to see how we got here.