Accession to the European Communities: May 10th, 1972
Yes: 83%
No: 17%
Turnout71%
Allowed the State to become a member of the EEC
The Single European Act: May 26th, 1987
Yes: 69.9%
No: 30.1%
Turnout: 44.1%
Attempt to revise the Treaty of Rome, it deepened integration and set a deadline for the single market.
The Maastricht Treaty: June 18th, 1992
Yes: 69.1%
No:30.9%
Turnout: 57.3%
Began the process of a single currency, created European citizenship and a three-pillared European Union
Amsterdam Treaty : May 22nd, 1998
Yes: 61.74%
No: 38.26%
Turnout: 56.2%
Provided for enlargement and increased EU role in home affairs.
Nice Treaty I: June 7th, 2001
No: 53.87%
Yes: 46.13%
Turnout: 34.79%
Reformed decision making, revised voting powers , introduced a limit to commissioner numbers
Nice II: October 19th, 2002
Yes: 62.89%
No: 37.11%
Turnout: 49.47%
The main difference was a prohibition on Ireland entering an EU-wide defence policy without constitutional amendment.
Lisbon Treaty I: June 12th, 2008
No: 53.4%
Yes: 46.6%
Turnout: 53%
Aimed to centralise EU power, created a new post of president new powers for the parliament, and to harmonise legal systems.
Lisbon II : October 2nd, 2009
Yes: 67.1%
No: 32.9%
Turnout: 58%
Ireland given guarantees that the treaty would not affect taxation, neutrality and the right to life.