Question: When was a free-travel area created between Ireland and the country where the After the Morning performer had citizenship?

<P0-S0> northern ireland was created in 1921, when ireland was partitioned between northern ireland and southern ireland by the government of ireland act 1920. unlike southern ireland, which would become the irish free state in 1922, the majority of northern ireland's population were unionists, who wanted to remain within the united kingdom. <P0-S1> most of these were the protestant descendants of colonists from great britain. <P0-S2> however, a significant minority, mostly catholics, were nationalists who wanted a united ireland independent of british rule. <P0-S3> today, the former generally see themselves as british and the latter generally see themselves as irish, while a distinct northern irish or ulster identity is claimed both by a large minority of catholics and protestants and by many of those who are non-aligned. <SEP> <P1-S0> "After the Morning" is the third solo album from folk artist Cara Dillon. <P1-S1> It was recorded at their home studio in Frome, Somerset, Mayfair, Kore, Amberville and Sun Street Studios. <P1-S2> The strings and brass were recorded in Prague. <P1-S3> Similar to her previous albums, "After the Morning" was produced by Sam Lakeman, her husband and musical partner. <P1-S4> Additional production was by Mike 'Spike' Drake, who also mixed the album. <P1-S5> The album features the singles "Never in a Million Years", and the double A-side of "I Wish You Well" and "This Time". <SEP> <P2-S0> Ireland and the United Kingdom are both part of the European Union (EU). <P2-S1> The Crown Dependencies are not a part of the EU however do participate in certain aspects that were negotiated as a part of the UK's accession to the EU. <P2-S2> Neither the United Kingdom or Ireland are part of the Schengen area, that allow passport-free travel between EU members states. <P2-S3> However, since the partition of Ireland, an informal free-travel area had existed across the region. <P2-S4> In 1997, this area required formal recognition during the course of negotiations for the Amsterdam Treaty of the European Union and is now known as the Common Travel Area. <SEP> <P3-S0> the northern ireland peace process has led to a number of unusual arrangements between the republic of ireland, northern ireland and the united kingdom. <P3-S1> for example, citizens of northern ireland are entitled to the choice of irish or british citizenship or both and the governments of ireland and the united kingdom consult on matters not devolved to the northern ireland executive. <P3-S2> the northern ireland executive and the government of ireland also meet as the north/south ministerial council to develop policies common across the island of ireland. <P3-S3> these arrangements were made following the 1998 good friday agreement. <SEP> <P4-S0> Cara Elizabeth Dillon (born 21 July 1975, Dungiven, County Londonderry, Northern Ireland) is an Irish folk singer. <P4-S1> In 1995, she joined the folk supergroup Equation and signed a record deal with Warners Music Group. <P4-S2> After leaving the group, she collaborated with Sam Lakeman under the name Polar Star. <P4-S3> In 2001, she released her first solo album, "Cara Dillon", which featured traditional songs and two original Dillon\Lakeman compositions. <P4-S4> The album was an unexpected hit in the folk world, with Dillon receiving four nominations at the 2002 BBC Radio 2 Folk Awards.