Question: The phenomenon known as Beatlemania originated in the United Kingdom, birthplace of the Beatles, when the band first realised enormous popularity there in 1963, the Beatles achieved a commercial breakthrough with their second UK single release, "Please Please Me", a song and the second single released by English rock group the Beatles in the United Kingdom, and the first to be issued, in which country?

Context articles: The Beatles (No. 1)
Beatles and Rolling Stones rivalry
Hold Me Tight
Please Please Me (song)
Beatlemania in the United Kingdom
The Beatles
Ask Me Why
Do You Want to Know a Secret
Please Please Me
P.S. I Love You (Beatles song)

The Beatles (No. 1) is an EP released by The Beatles in the United Kingdom on 1 November 1963.
 It is the Beatles third British EP and was only released in mono; its catalogue number is Parlophone GEP 8883.
 Containing songs from "Please Please Me", the cover was taken in the same photoshoot as the "Please Please Me" and "1962-1966" covers.
 It was also released in Argentina and New Zealand.
"The Beatles" and "The Rolling Stones" were arguably the biggest bands of the 1960s.
 Both bands started their careers in the early 1960s in the United Kingdom and rose to fame as part of the British invasion.
 The Beatles rose to fame in the UK in 1963 with their singles "Please Please Me" and 'Love Me Do".
 After a successful album contract the band decided to leave Liverpool and move to London.
 The Rolling Stones were a struggling band at the time and the Beatles had become famous as a self contained Rock Band.
 Original song content was getting tougher to acquire in the United Kingdom so the Rolling Stones were a Rock and Roll Blues cover group.
 On meeting the Beatles at a London Pub; John Lennon and Paul McCartney agreed to write an original single for the Rolling Stones called "I Wanna Be Your Man".
 The song gave the Stones their first commercial success and Mick Jagger and Keith Richards began writing as well.
"Hold Me Tight" is a rock and roll song by English rock group the Beatles from their 1963 album "With the Beatles".
 It was first recorded during the "Please Please Me" album session, but not selected for inclusion and re-recorded for their second album.
"Please Please Me" is a song and the second single released by English rock group the Beatles in the United Kingdom, and the first to be issued in the United States.
 It was also the title track of their first LP, which was recorded to capitalise on the success of the single.
 It was originally a John Lennon composition (credited to Lennon–McCartney), although its ultimate form was significantly influenced by George Martin.
 John Lennon: "Please Please Me is my song completely.
 It was my attempt at writing a Roy Orbison song, would you believe it?
 I wrote it in the bedroom in my house at Menlove Avenue, which was my auntie's place".
The phenomenon known as Beatlemania originated in the United Kingdom, birthplace of the Beatles, when the band first realised enormous popularity there in 1963.
 Returning in 1962 from a highly formative two-year residency in Germany, the Beatles achieved a commercial breakthrough with their second UK single release, "Please Please Me" early in 1963, but gained "Superstar" status with the release of "She Loves You" later that year.
 There followed an almost non-stop series of concerts and tours, attended with feverish enthusiasm across the UK, for the whole of the following year.
 The Beatles' popularity in the UK came to exceed even that of the notable American artists Tommy Roe, Chris Montez and Roy Orbison, whose UK chart success at the time did not keep them from being overshadowed by the Beatles during their 1963 nationwide tours with the lower-billed band — an achievement previously unknown for a UK act.
The Beatles were an English rock band formed in Liverpool in 1960.
 With members John Lennon, Paul McCartney, George Harrison and Ringo Starr, they became widely regarded as the foremost and most influential act of the rock era.
 Rooted in skiffle, beat and 1950s rock and roll, the Beatles later experimented with several musical styles, ranging from pop ballads and Indian music to psychedelia and hard rock, often incorporating classical elements and unconventional recording techniques in innovative ways.
 In 1963 their enormous popularity first emerged as "Beatlemania", and as the group's music grew in sophistication in subsequent years, led by primary songwriters Lennon and McCartney, they came to be perceived as an embodiment of the ideals shared by the counterculture of the 1960s.
"Ask Me Why" is a song by the English rock band the Beatles originally released in the United Kingdom as the B-side of their hit single "Please Please Me".
 It was also included on their first UK album, "Please Please Me".
"Do You Want to Know a Secret?"
 is a song by English rock group the Beatles from the 1963 album "Please Please Me", sung by George Harrison.
 In the United States, it was the first top ten song to feature Harrison as a lead singer, reaching No. 2 on the Billboard chart in 1964 as a single released by Vee-Jay, VJ 587.
Please Please Me is the debut studio album by English rock band the Beatles.
 Parlophone rush-released the album on 22 March 1963 in the United Kingdom to capitalise on the success of their singles "Please Please Me" (No. 1 on most lists though only No. 2 on "Record Retailer") and "Love Me Do" (No. 17).
"P.S. I Love You" is a song composed principally by Paul McCartney (credited to Lennon–McCartney) and recorded by the English rock band the Beatles, with McCartney on lead vocal.
 It was released on 5 October 1962 as the B-side of their debut single "Love Me Do" and is also included on their 1963 album "Please Please Me".
 It was later included on the 1964 American release "Introducing The Beatles", its 1965 reissue "The Early Beatles" and the 1977 Beatles compilation "Love Songs".