Question: Same-sex marriage is legal (nationwide or in some parts) in which marriage a devolved issue in parts of the United Kingdom, and the status of same-sex marriage is different in England and Wales, Scotland and Northern Ireland?

Context articles: Same-sex marriage in Mississippi
Same-sex marriage in the Sixth Circuit
Same-sex marriage in Arkansas
Marriage in England and Wales
Same-sex marriage by Circuit Court
Same-sex marriage in the United Kingdom
Same-sex marriage in New England
Same-sex union legislation
Same-sex marriage in the Seventh Circuit
Same-sex marriage in Canada

Same-sex marriage is legal in Mississippi.
 On November 25, 2014, U.S. District Court Judge Carlton W. Reeves of the District Court for Southern Mississippi, ruled Mississippi's ban on same-sex marriage unconstitutional.
 Enforcement of his ruling was stayed pending appeal to the Fifth Circuit Court of Appeals.
 On June 26, 2015, the U.S. Supreme Court ruled in "Obergefell v. Hodges" that the denial of marriage rights to same-sex couples is unconstitutional.
 On June 29, the state attorney general ordered clerks to issue marriage licenses to same-sex couples.
 On July 1, the Fifth Circuit lifted its stay and Judge Reeves ordered an end to Mississippi's enforcement of its same-sex marriage ban.
 However, until July 2, 2015, several counties in Mississippi continued to refuse to issue same-sex couple marriage licenses, including DeSoto, Jasper, Jones, Newton, Pontotoc, Simpson and Yalobusha.
On April 28, 2015, the Supreme Court of the United States heard oral arguments for "Obergefell v. Hodges" (Ohio), which was consolidated with three other same-sex marriage cases from the other states in the Sixth Circuit: "Tanco v. Haslam" (Tennessee), "DeBoer v. Snyder" (Michigan), "Bourke v. Beshear" (Kentucky).
 On June 26, 2015 the Supreme Court reversed the Sixth Circuit's decision, paving the way for same-sex marriage to become legal in those states, and setting a precedent for the entire nation.
 All four states complied with the ruling the same day it was issued before the mandate was actually issued.
 Every state in the circuit had a district court ruling against their states' ban, but they were eventually stayed pending appeal.
 The Sixth Circuit consists of Kentucky, Michigan, Ohio, and Tennessee.
 On August 6, 2014, the Sixth Circuit heard oral arguments for same-sex marriage cases from each state within the circuit.
 On November 6, 2014, the Sixth Circuit in a split 2-1 decision, upheld the states' same-sex marriage bans, reversing the district courts' rulings that struck them down.
 The Sixth Circuit was the first and only circuit court since the landmark ruling "United States v. Windsor" to uphold the constitutionality of states' same-sex marriage bans which caused a circuit split.
Same-sex marriage in Arkansas is legal under the U.S. Supreme Court decision in "Obergefell v. Hodges", a landmark case in which same-sex marriage bans were struck down on June 26, 2015.
 Prior to that, same-sex marriage in Arkansas was briefly legal for a period beginning on May 9, 2014, as the result of a ruling by Sixth Judicial Circuit Judge Chris Piazza, striking down the state's constitutional and legislative ban on same-sex marriage as violating the Constitution of the United States.
 Approximately 541 same-sex couples received marriage licenses in several Arkansas counties before the Arkansas Supreme Court stayed his ruling pending appeal on May 16, 2014.
Marriage in England and Wales is legally recognised in the forms of both civil, and religious marriage for opposite sex couples only, and same sex marriage in register offices or an approved venue.
 Same-sex marriages cannot be solemnised in the Church of England, due to the church's doctrine and views on marriage.
 Canon laws forbid such from taking place.
 Marriage laws in England and Wales have historically evolved separately from marriage laws in other jurisdictions in the United Kingdom.
 There is a distinction between religious marriages, conducted by an authorised religious celebrant, civil marriages, conducted by a state registrar and same sex marriages, also conducted by a state registrar.
 The Marriage (Same Sex Couples) Act 2013 (c. 30) is an Act of the Parliament of the United Kingdom which legalised same-sex marriage in England and Wales.
 The legal minimum age to enter into a marriage in England and Wales is sixteen years, although this requires parental consent if a participant is under eighteen.
 Certain relatives are not allowed to marry.
 For foreign nationals, there are also residency conditions that have to be met before people can be married.
 Same-sex marriage was introduced under the Marriage (Same Sex Couples) Act in March 2014.
 Prior to this, civil partnerships had been made available to same-sex couples in the United Kingdom in 2005, granting rights and responsibilities virtually identical to civil marriage.
 Civil partnerships remain to be available to only same-sex couples, despite a call by Peter Tatchell for there to be an equal status regarding such civil unions.
 The Isle of Man is the only part of the British Isles where civil partnership are available to all irrespective of gender.
Prior to the landmark ruling "United States v. Windsor", the constitutionality of banning same-sex marriage was upheld by the Eighth Circuit in "Citizens for Equal Protection v. Bruning".
 After the "Windsor" ruling, many same-sex marriage bans were struck down by lower courts.
 The Tenth, Fourth, Seventh, and Ninth circuits all ruled that same-sex marriage bans were unconstitutional.
 The cases that made it to these circuit courts originated in district courts which for the most part also struck down same-sex marriage bans.
 When a circuit court struck down a state's same-sex marriage ban, it did not directly strike down same-sex marriage bans in other states within the circuit.
 However, it paved the way for same-sex marriage bans to be struck down in the entire circuit due to the precedent it set for district courts within the circuit to follow.
 In some states, same-sex marriage was already legal before a federal circuit court ruled on the matter.
 The Sixth Circuit ruled that same-sex marriage bans were not unconstitutional and reversed the district court rulings that struck down same-sex marriage bans.
 Since this was the only circuit court to rule this way post-"Windsor", this created a circuit split which ultimately led to the Supreme Court of the United States deciding to resolve the issue once and for all.
 They ruled that same-sex marriage bans violate the constitution in the landmark ruling "Obergefell v. Hodges" which was the consolidated case that covered each state in the Sixth Circuit.
 Some circuit courts have not ruled on the constitutionality of same-sex marriage bans at all.
 Many circuit courts had pending same-sex marriage cases, but decided to hold off on litigation until the Supreme Court ruled on the matter.
Same-sex marriage is legal in the United Kingdom, with the exception of Northern Ireland.
 Marriage is a devolved issue in parts of the United Kingdom, and the status of same-sex marriage is different in England and Wales, Scotland and Northern Ireland.
Even before the "Obergefell v. Hodges" Supreme Court ruling making same-sex marriage legal across all the states of the United States, same-sex marriage was legal in all of the New England states: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont, as well as in the neighboring states of New York, New Jersey, Pennsylvania, Maryland and Delaware.
 The New England region has been noted for being the nucleus of the same-sex marriage movement in the United States, with the region having among the most widespread and earliest legal support of any region.
 In 2004, Massachusetts became the first state in the United States to legalize same-sex marriage, to be followed by three more states between October 2008 and June 2009.
 This followed Vermont being the first-in-the-nation with civil unions in 2000.
 Before the 2012 election, California (2008), Iowa (2009), New York (2011) and the District of Columbia (2010) had been the only U.S. jurisdictions outside New England to have performed same-sex marriages, though same-sex marriages in California had been halted following the passage of Proposition 8.
Same-sex marriage is legal (nationwide or in some parts) in the following countries: Argentina, Belgium, Brazil, Canada, Colombia, Denmark, Finland, France, Germany, Iceland, Ireland, Luxembourg, Malta, Mexico, the Netherlands, New Zealand, Norway, Portugal, South Africa, Spain, Sweden, the United Kingdom, the United States, and Uruguay.
On September 4, 2014 the Seventh Circuit Court of Appeals unanimously upheld district court rulings striking down same-sex marriage bans in Indiana, and Wisconsin, just nine days after the court heard oral arguments.
 The Seventh Circuit consists of Illinois, Indiana, and Wisconsin.
 Same-sex marriage was already legal in Illinois before the Circuit Court's decision.
 Same-sex marriages were performed in Indiana and Wisconsin after their bans were struck down by district courts and before those decisions were stayed.
 Recognition of out-of-state same-sex marriage was possibly de jure legal in Indiana until Baskin v. Bogan was stayed by the Seventh Circuit.
 On October 6, 2014, the Supreme Court of the United States denied cert, legalizing same-marriage in both Indiana and Wisconsin.
 As a result, same-sex marriage is legal in every state within the circuit.
Same-sex marriage in Canada was progressively introduced in several provinces by court decisions beginning in 2003 before being legally recognized nationwide with the enactment of the "Civil Marriage Act" on July 20, 2005.
 On June 10, 2003, the Court of Appeal for Ontario issued a decision immediately legalizing same-sex marriage in Ontario, thereby becoming the first province it was legal.
 The introduction of a federal gender-neutral marriage definition made Canada the fourth country in the world, and the first country outside Europe, to legally recognize same-sex marriage throughout its borders.
 Before the federal recognition of same-sex marriage, court decisions had already introduced it in eight out of ten provinces and one of three territories, whose residents collectively made up about 90% of Canada's population.
 More than 3,000 same-sex couples had already married in those areas before the "Civil Marriage Act" was introduced.
 Most legal benefits commonly associated with marriage had been extended to cohabiting same-sex couples since 1999.