The tradition continued after the city became part of the United States with the Louisiana Purchase. As African music had been suppressed in the Protestant colonies and states, the weekly gatherings at Congo Square became a famous site for visitors from elsewhere in the U.S. In addition, because of the immigration of refugees (some bringing enslaved Africans) from the Haitian Revolution, New Orleans received thousands of additional Africans and Creoles in the early years of the 19th century. They reinforced African traditions in the city, in music as in other areas. Many visitors were amazed at the African-style dancing and music. Observers heard the beat of the "bamboulas" and wail of the "banzas", and saw the multitude of African dances that had survived through the years. There were a variety of dances that could be seen in Congo Square including the Bamboula, Calinda, Congo, Carabine and Juba. The rhythms played at Congo square can still be heard today in New Orleans jazz funerals, second lines and Mardi Gras Indians parades.