Beatlemania had already swept England before America. When the Beatles made it in America it changed England's perception of music. Until then, they were of the mind that no British act could really be big here.
Cliff Richards is still big in England but a nobody over here (despite numerous attempts to release his hits). Lonny Donnigan too.
That was essentially the point made when I tweaked those English tarts.
Without America, the Beatles would've attained the same level of success as Cliff Richard.
It put an end to the America bashing at the time due to their loss for words.