Question: Which part of nothern Europe includes a country whose second year of competitive football was 1921?

Context paragraphs:
Baltic states: The Baltic states, also known as the Baltic countries, Baltic republics, Baltic nations, or simply, the Baltics (Estonian: "Balti riigid, Baltimaad" , Latvian: "Baltijas valstis" , Lithuanian: "Baltijos valstybės" ), are the three countries in northern Europe on the eastern coast of the Baltic Sea: Estonia, Latvia and Lithuania.

1921 in Brazilian football: The following article presents a summary of the 1921 football (soccer) season in Brazil, which was the 20th season of competitive football in the country.

List of Peterborough United F.C. seasons: Peterborough United Football Club is an English association football club based in Peterborough, Cambridgeshire.  After former Southern League club Peterborough & Fletton United folded in 1932, there had been no senior football in the Peterborough area.  In the summer of 1934, a new professional club, named Peterborough United, was founded to take its place.  It was welcomed into membership of the Midland League for 1934–35, and the club's first team finished that initial season in mid-table.  They entered the national cup competition, the FA Cup, the following season, but lost their opening match 3–0 at home to Rushden Town in the first qualifying round.  When competitive football resumed after the Second World War, Peterborough enjoyed improved performances in both league and cup competition.  In the cup, they regularly reached the rounds proper, and progressed to the fourth round in 1956–57 and 1959–60, eliminating two Football League teams on the first occasion and three on the second.  In the Midland League, they finished second in 1953–54, third the following year, and then embarked on a run of five consecutive championships, scoring more than 100 goals in each campaign.  Repeated attempts at election to the Football League failedalbeit narrowly in 1958–59until they finally gained admission to the Fourth Division in 1960 at the expense of Gateshead.

1920–21 Burnley F.C. season: The 1920–21 season was the 33rd season of competitive football played by Burnley Football Club.  Burnley began the season confidently, despite not having played a match for almost four months before their first league fixture of the season.  After losing their first three games, Burnley embarked on a 30-match unbeaten league run from 4 September 1920 until 26 March 1921, winning the Football League First Division and becoming English champions for the first time in their history.  Burnley's unbeaten run stood as a Football League record for over 80 years, until it was bettered by Arsenal in the 2003–04 season.  Burnley ended the 1920–21 season on 59 points, having won 23 games, drawn 13, and lost 6.

List of post-war Tranmere Rovers F.C. players: Tranmere Rovers Football Club is an English association football club based in Birkenhead, Wirral.  Founded in 1884, they played their first games under the name Belmont F.C.; in 1885, before the start of their second season, they adopted the name Tranmere Rovers.  In 1889, Tranmere entered the West Lancashire League, and progressed through the Combination, the Lancashire Combination and the Central League.  On 27 August 1921, as founder members of Division Three North, they won their first Football League match 4–1 against Crewe Alexandra at Prenton Park.  Tranmere have played in the Football League ever since, with the exception of 1939–1946, when competitive football was suspended due to the Second World War.  Their highest league finish was fourth in the First Division which, at the time, was the second tier of the league pyramid, in the 1992–93 season.

Estonia national football team 1921: The 1921 season was the second year of competitive football in the Baltic country as an independent nation.

1921–22 Torquay United F.C. season: The 1921–22 Torquay United F.C. season was Torquay United's first season in competitive football and their first season in the Western League.  The season runs from 1 July 1921 to 30 June 1922.

1993 in Lithuanian football: The 1993 season was the second year of competitive football (soccer) in Lithuania as an independent nation since regaining independence from the Soviet Union in 1991.

1921–22 Manchester City F.C. season: The 1921–22 season was Manchester City F.C.'s thirty-first season of league football, and eighth consecutive season in the Football League First Division, excluding the four years during the First World War in which no competitive football was played.

List of Tranmere Rovers F.C. players (1921–39): Tranmere Rovers Football Club is an English association football club based in Birkenhead, Wirral.  Founded in 1884, they played their first games under the name Belmont F.C.; in 1885, before the start of their second season, they adopted the name Tranmere Rovers.  In 1889, Tranmere entered the West Lancashire League, and progressed through the Combination, the Lancashire Combination and the Central League.  On 27 August 1921, as founder members of Division Three North, they won their first Football League match 4–1 against Crewe Alexandra at Prenton Park.  Tranmere have played in the Football League ever since, with the exception of 1939–1946, when competitive football was suspended due to the Second World War.  Their highest league finish was fourth in the First Division which, at the time, was the second tier of the league pyramid, in the 1992–93 season.

Supporting paragraphs: Estonia national football team 1921 Baltic states
Answer: The Baltic states