Rumba 

The Rumba originated from Cuba, where African slaves imported to the country introduced dances that emphasized movements of the body rather than feet. The rural form of the Rumba in Cuba was described as a pantomime of barnyard animals, and was an exhibition rather than a participation dance.

Around 1928/1929 the actual steps and figures of this dance were not clear. Many people treated and danced it, like a new type of foxtrot with additional hip actions.  After the World War II The rumba was further developed into the "Cuban Rumba" by monsieur Pierre and Doris Lavell which had a school in the Regent street, London but still the standardization was a problem until Walter Laird started to write his Latin books his work was accepted by many official dance Associations and the standardization was a fact.