In 1889. And 10, 11, or 12 in half the states. I thought that was a *medieval* thing. What can you conceivably consent to at 7yo, besides like agreeing to put on a warmer coat? Also, in 2001 three-quarters of American schoolgirls agreed that "everyone needed to be married." Eighty-eight percent of Japanese schoolgirls disagreed with the same statement. All that and more in a short Pop Quiz on Marriage in the NYT this a.m., as New York gets ready to vote on whether to be the last state to approve no-fault divorce.
Maybe that Japan figure isn't so surprising given the whole weird enjo kosai thing, although apparently the quiz-makers were glad to toss that in as "just another modern society" with a misleadingly phrased question. Is it American and Japanese "women" or "schoolgirls"? (By the way, if you can't remember a Japanese phrase like, say, enjo kosai, don't expect Google searches for "Japanese schoolgirl" to help you any.)