What does Brazilian samba have to do with its demographic characteristics?

Samba is the national dance of Brazil, with a very fast tempo of up to 200 beats per minute. On a simple stage by the Amazon River, Brazilian women in three-pointed styles fervently twisted their bodies, sweat dripping down their brown and black bodies, as if they didn't know what it meant to be tired. The Brazilians below the stage were equally engaged, gyrating frantically to the rhythm. People crowded together, the mood seems to be more enthusiastic than the weather. When they get tired of dancing, they run to the river to take a bath and then come back to dance again. The total population of Brazil is 189.8 million. There are more women than men, with women accounting for 51.2% of the population. However, there are significant regional variations, with women accounting for as much as 53.1 percent of the population in the central and western regions alone, where there are frequent changes of address. The composition of ethnic groups has changed significantly, with the proportion of Caucasians dropping to 49.4 per cent and the proportion of people of color reaching 49.7 per cent, with people of color already outnumbering Caucasians. Among them, 42.3% are mixed-race, 7.4% are black, and 0.8% are others.