Mexico cession is the answer
I believe its Germanys reunification
The Irish republic is a parliamentary democracy. Its constitution was promulgated in 1937 and can be amended through a referendum. The country’s head of state, the president (uachtarán), is elected directly by the public for a term of seven years and is eligible for reelection for a second term. The president normally acts on the advice of the government but also consults an advisory Council of State in the exercise of certain functions. The president signs and promulgates bills passed by the Oireachtas (Parliament) and, when so advised by the prime minister (taoiseach), summons and dissolves the Oireachtas. The president may, however, refuse to dissolve the Oireachtas on the advice of a prime minister who has ceased to command a majority in the Dáil Éireann (House of Representatives). The president is the guardian of the constitution and may, in certain circumstances, submit a bill passed by the Oireachtas to the people in a referendum or refer it to the Supreme Court to decide on its constitutionality.
There are two houses of the Oireachtas—the Dáil and the Seanad Éireann (Senate). Chief legislative power is centred in the 158-member Dáil. The Seanad may delay bills passed by the Dáil, or it may suggest changes in them, but it cannot indefinitely block their passage into law.
Executive power is vested in the prime minister, who heads the cabinet and presides over its meetings. The prime minister, the deputy prime minister (tánaiste), and the minister for finance must be members of the Dáil. The other government ministers must be members of either house, but no more than two may be senators.
