Final answer:
The Beatles performed on The Ed Sullivan Show in 1964, which marked the beginning of their popularity in the United States.
Step-by-step explanation:
In 1964, The Beatles made their legendary appearance on The Ed Sullivan Show.
Their performance on the show is considered a significant moment in American pop culture history.
It was the beginning of Beatlemania in the United States, and their performance introduced the British Invasion to American audiences.