Bubba Wallace had to fight back tears Monday after he won his first-ever NASCAR Cup Series race ... getting emotional thinking about how he's the first Black driver to accomplish the feat since 1963.
The 27-year-old took home the victory after rain forced the YellaWood 500 to end early at Talladega Superspeedway in Alabama ... and it didn't take long for Wallace to realize how big the moment was for him.
Wallace went crazy with his team seconds after NASCAR called it -- hugging friends and letting out loud yells of joy.