Polkas came over from Europe – mainly Germany and Poland. Here is the Americanized country polka they dance now. Song is “Cotton Eye Joe”.
The polka is a swift dance usually done with a pair of dancers who are good at not stepping on each other's feet!
The beer barrel polka is one of the most famous German polkas that is danced to worldwide. "Roll out the barrel, we'll have a barrel of fun!". (In German the song is actually "Rosamunde" and it is more of a love song than a beer barrel song :))