What genre is described as an Afro-Cuban song and dance form that emerged in the 1940s?

The genre described as an Afro-Cuban song and dance form that emerged in the 1940s is the Mambo. This lively and energetic style is characterized by its strong rhythms, syncopation, and brass instrumentation, which were influenced by jazz. The Mambo developed in Havana, Cuba, and became popular in the United States, particularly in the New York dance scene, during the mid-20th century. Its infectious rhythm and danceable beat made it a staple in Latin dance clubs and ballrooms, and it played a significant role in the evolution of Latin music in the United States.

While salsa also incorporates Afro-Cuban elements, it evolved later, particularly in the 1970s, as a fusion of various Latin styles. Bachata and Bossa Nova refer to different musical traditions; Bachata originates from the Dominican Republic and has a distinct romantic and slower style, while Bossa Nova is a Brazilian genre blending samba and jazz influences. Understanding the historical context and origins of these genres highlights why Mambo is the correct answer.