The English country dance tradition in the USA evolved into contradance (corruption of "country dance"). It diverged in the 18th century when English country dances were almost entirely longways dances, so there are only a few squares formations left, almost vestigial. Then in English the whole explosion when the quadrille arrived from France and began hybridizing with English country dance happened, and then the waltz... Meanwhile in the USA, contradance continued on without that influence. Though they later picked up the waltz, and a contradance today conventionally ends each half of the dance with a waltz, the first of which you conventionally dance with someone not your significant other and the second you dance with your significant other if you have one.

Contradance is where I tend to start totally new dancers. The community tends to be extremely welcoming. Most dances have an expectation that experienced dancers will spend at least part of the evening dancing with newcomers and trying to get them up to speed and comfortable. Once they've got the sense of weight and motion, then you can drag them off to swing, ballroom, or whatever else, but it really is an incredibly effective setting for instilling some fundamentals and confidence.

It's also interesting because you can go from Virginia to Washington state and walk into a contradance and wonder if you traveled at all.