Final answer:
Desi Arnaz popularized Latin music on television, especially through 'I Love Lucy', introducing American audiences to genres like the conga, rumba, and mambo, and thereby influencing the mid-20th-century popularity of Latin music in the U.S.
Step-by-step explanation:
The individual who popularized Latin music through television and had a significant influence in spreading the genre across American households was Desi Arnaz. He was an iconic figure in the entertainment industry, particularly through his role on the famous television show 'I Love Lucy', where he often showcased his musical talents and brought the vibrant sounds of Latin music to a broad audience. Arnaz played a crucial part in introducing the TV viewers to Latin musical genres such as the conga, rumba, and mambo, directly influencing the popularity of Latin music in the United States during the mid-20th century.