Buenos Aires is one of the largest metropolises in the world. One thirds of Argentina’s 41 million people live in Buenos Aires. The city was built by the European immigrants. At the beginning of the 19th century, Buenos Aires was only a small town with a mixed population of Native Americans and Spanish, often intermarried. The Spanish brought in slaves in large number with their music and dances from Africa. During the second half of the 19th century, the Argentine government made a conscious decision to reduce the black population and expand the white population, which led to the massive immigrations from Span, Italy, and other parts of Europe to Argentina. By the end of the 19th century the original population of Buenos Aires has been completely swamped by the European immigrants. We can trace tango to 150 years ago to its African origin from which the primitive form of the dance first appeared, but the main inventors of tango were the European immigrants to Argentina by the late 19th century and early 20th century who built the modern city of Buenos Aires.
Here is an example of the tango danced in the milongas of Buenos Aires.