It speaks to the weakening of America's religious backbone, which has lost influence with each passing generation.
The same shift to densely populated urban areas has left many of the institutions that once defined, or at least (wink wink) heavily influenced, our romantic decisions behind.
The most notable is the collapse of family in this regard, which once played the largest role in societal matchmaking—"connecting young people with potential opposite-sex, same-race, and same-religion partners has always been one of the core functions of the family," Rosenfeld wrote in a 2012 paper.
The declining influence comes in large part thanks to the diminishing need for one's parents (or their friends) to play cupid, but also speaks to the blurring of once rigid class borders.
But work, school, community, all of which used to be fertile breeding grounds, have lost their relevancy too.
Now that our lives are no longer sparse, we don't lean quite so heavily on the mini communities we have historically looked to for companionship.
Of course, the data also show the influence of other things.
The drop in primary and secondary school matchmaking is indicative of the rising age of marriage.
And there's the Internet—most of the above trends can be attributed, at least partly, to its rise.
Last month, the BBC explained how love has changed over the years. Future spouses could be found living around the corner.
Or at least in your part of town," the piece said, directing attention to a series of charts.
There was one about how close to one another people who ended up together used to live (the answer is very close).