On Wednesday night, the singers, known for their energetic dancing, performed a rendition of Whitney Houston’s Higher Love.
They wowed the audience and talent show judges and will be performing in the final with four other acts.
Judge Simon Cowell, well known for making blunt and controversial comments about contestants, said the South African group really deserved a spot in the final.
Afterwards the choir tweeted: “Our hope is that our performance inspired you to a ‘Higher Love’. We are one world.”
This resonated with some South Africans on social media after a week which has seen violence targeting foreigners and protests over the rape and killing of a student.
“South Africa this is who we are, not the narrative we’ve been watching unfold on the streets,” one person tweeted.
The Ndlovu Choir is from a small town in Limpopo and was formed 2009.
The singers came into fame earlier in this year with their cover of Ed Sheeran’s song Shape of You
They have performed two other songs during America’s Got Talent: My African Dream and Waka Waka, Shakira’s official song for the 2010 World Cup, which was held in South Africa.
The final will be broadcast later this month.