Ireland & United States
The United States is Ireland's single most important economic partner: American multinationals anchor the Irish economy, and Irish investment in the US supports hundreds of thousands of American jobs in return. The relationship also runs through the White House's St Patrick's Day tradition and a diaspora tens of millions strong — but 2025's US tariffs on the EU exposed how exposed Ireland is to shifts in American trade policy.
How the relationship developed
Successive waves of Irish emigration to the US, accelerating sharply after the Great Famine (1845–52), build the Irish-American diaspora.
US-headquartered tech and pharmaceutical multinationals begin using Ireland as their European base, drawn by a 12.5% corporation tax rate and EU market access.
US diplomacy, including President Clinton's personal engagement and Senator George Mitchell's chairmanship of the talks, helps deliver the Good Friday Agreement.
Ireland becomes home to 16 of the top 20 global technology firms and a hub for US pharmaceutical manufacturing, alongside a reverse flow of Irish investment into the US.
The US imposes tariffs of 15% on most EU imports, including from Ireland, raising particular concern for Ireland's pharmaceutical exports.
Key issues in the relationship today
US tariffs on the EU
2025's 15% tariff on most EU goods, agreed as part of a wider US-EU trade framework, directly affects Irish exporters. Ireland's pharmaceutical sector — the single largest component of Irish goods exports to the US — is seen as especially exposed if US policy pushes manufacturing onshore.
Corporation tax & FDI
Ireland's low corporation tax rate has been central to attracting US multinationals for three decades. International moves toward a global minimum corporate tax rate have reduced — but not eliminated — that advantage.
The reciprocal relationship
The relationship isn't one-directional: Irish companies' investment in the US supports an estimated 200,000 American jobs across all 50 states, a fact Irish officials frequently raise in Washington to argue against protectionist measures.
St Patrick's Day diplomacy
The Taoiseach's annual White House visit each St Patrick's Day is a uniquely direct channel for Irish access to the US President — used in recent years to press the case against tariffs and for continued US investment.
The diaspora connection
An estimated 31.5 million Americans claimed Irish ancestry in the 2021 US Census — about 9.5% of the population, second only to German ancestry. Irish-American political and cultural influence remains significant, from St Patrick's Day celebrations nationwide to a long line of Irish-American members of Congress and presidents.
A US opinion polling tracker — presidential approval, generic congressional ballot, and midterm polling — is in development for this page.