Explain two areas of disagreement between the DUP and Sinn Féin.

The two parties disagree about Brexit. In the 2016 EU Referendum campaign, the parties campaigned on opposite sides, with the DUP advocating for a Leave vote, while Sinn Féin advocated for a Remain vote. The DUP announced its intention to campaign for a Leave vote following their disappointment with Prime Minister David Cameron's attempts to re-negotiate the UK's position within the EU. Sinn Féin believed that membership of the EU had benefitted the island of Ireland as a whole, especially in economic terms. This is despite Sinn Féin's history of Euroscepticism, such as campaigning for a No vote in the Irish Referendum on joining the European Economic Community in 1972. Some have argued that the divisions between the parties have been exacerbated by Brexit, as the confusion over the Irish border and constitutional questions that have arose following the result has not facilitated a good working relationship between the parties.

The two parties disagree over the introduction of same-sex marriage in Northern Ireland, with the DUP opposing its introduction and Sinn Féin supporting its introduction. The DUP's opposition stems from the fact that they are a socially conservative political party and have always had strong ties to the Free Presbyterian Church of Ulster; the DUP was founded by Ian Paisley, who also founded the Free Presbyterian Church of Ulster. Many of the DUP's policies are therefore based on Christian values, including a traditional stance on marriage. Sinn Féin are, on the whole, a socially liberal political party, and this explains their support for the introduction of same-sex marriage in Northern Ireland and support for the increase in LGBT+ rights more generally. Sinn Féin also campaigned for a Yes vote in the 34th Amendment Referendum in the Republic of Ireland to legalise same-sex marriage in 2015. The parties' disagreement on the issue was one of the main sticking points in the recent talks between the parties to go back into government.