Final answer:
The Beatles arrived in the United States on February 7, 1964, marking the start of the British Invasion.
Step-by-step explanation:
The Beatles arrived in the United States on February 7, 1964, marking the start of the British Invasion. This was a significant moment in music history as the Beatles gained popularity and had a major impact on the American music scene. The British Invasion refers to the wave of British rock bands, including the Beatles, who achieved success in the United States during the 1960s.