May`s conservative and unionist party needs the support of the DUP to stay in power, but the DUP has never backed the Good Friday deal. In fact, it was the only party to have retained the support of the agreement in 1998. She spent the most time rewriting or undermining the agreement. In 1922, the newly created United Kingdom and the Land of Bavaria concluded an agreement on the Common Travel Area (CTA). This gave British and Irish citizens the right to travel, live and work in both jurisdictions. Passport controls are not used to travel between them. The free movement provisions resulting from EU membership replaced them to some extent, but the parties kept their bilateral agreement alive when it did not have treaty status. In 2011, the British and Irish governments informally agreed to continue their joint controls upon entry of non-EEA nationals into the CTA.  When the Kingdom finally leaves the EU, the border between Northern Ireland and the Republic of Ireland will require a border apparatus to check visitors` passports, track the provenance and quality of goods and recover appropriate taxes or customs. The agreement reaffirmed its commitment to “mutual respect, civil rights and religious freedoms for all within the Community.” The multi-party agreement recognized “the importance of respect, understanding and tolerance with regard to linguistic diversity,” particularly with regard to the Irish language, Ulster Scots and the languages of other ethnic minorities in Northern Ireland, “all of which are part of the cultural richness of the Island of Ireland.” As a result, people and goods are currently crossing the border without stopping.
After Brexit, the border between Northern Ireland and the Republic of Ireland becomes an external border of the EU.  In theory, a “hard” border could return, both with fewer and monitored border crossing points, to support the necessary customs infrastructure.  Both the EU and UK negotiating teams have made it clear that this result will not be acceptable in any final withdrawal agreement.   The multi-party agreement required the parties to “use all the influence they could have” to obtain the decommissioning of all paramilitary weapons within two years of the adoption of the agreement by The Referendums. The standardization process has forced the British government to reduce the number and role of its armed forces in Northern Ireland “to a level compatible with a normal peaceful society.” These include the elimination of security measures and the abolition of special emergency powers in Northern Ireland. The Irish government has pledged to conduct a “thorough review” of its violations of national law. After the British Parliament voted to leave the European Union, all parties said they wanted to avoid a hard border in Ireland, in part because of the historically sensitive nature of the border.