The Irish Contribution to American Independence: The Forgotten Founders

The Irish contribution to American independence runs far deeper than most Americans were ever taught in school. As the United States marks the 250th anniversary of independence in 2026, a remarkable chapter of shared history is coming back into focus: the men and women of Irish birth and Irish descent who helped forge the republic that became the most powerful nation on earth. From the signers of the Declaration of Independence to the generals who led the Continental Army, from spies operating behind British lines to the sailors who defended the new nation’s coastline, the Irish fingerprints on American freedom are everywhere.

How Ireland Shaped the American Revolution

The 1770s were a decade of profound upheaval on both sides of the Atlantic. Ireland itself was living under British rule, and the colonial grievances that drove American patriots to revolution were deeply familiar to Irish people who had spent generations under the same crown. When the Continental Congress declared independence in 1776, it resonated in the cottages and townhouses of Limerick, Antrim, Tyrone and Wexford as a statement about liberty that the Irish understood instinctively.

Emigration from Ireland to the American colonies had been substantial throughout the 18th century. Ulster Scots — the Scots-Irish who settled across Pennsylvania, Virginia and the Carolinas — formed one of the most significant emigrant communities in colonial America. Their experience of religious tension in Ireland gave them a natural sympathy for the revolutionary cause and a deep resistance to imposed authority. By the time the first shots were fired at Lexington and Concord in April 1775, Irish-born settlers were embedded in communities throughout the thirteen colonies, and many were ready to take up arms.

Irish-Born Signers of the Declaration of Independence

At least three of the 56 men who signed the Declaration of Independence were born in Ireland — a remarkable proportion when you consider the total population of the colonies at the time.

Matthew Thornton was born around 1714 in County Limerick and emigrated to New Hampshire as a child. He became a physician, a justice of the peace and eventually a delegate to the Continental Congress from New Hampshire. When he signed the Declaration in November 1776, he was one of its final signatories — an Irish immigrant, trained as a doctor, appending his name to the founding document of a new nation. He had come a long way from a small county in Munster.

James Smith was born in Ireland around 1719 and emigrated to Pennsylvania, where he built a career as a lawyer. He represented Pennsylvania at the Continental Congress and signed the Declaration in 1776. He was already in his late fifties — a reminder that the Revolution was not solely a young person’s enterprise, and that the Irish who had built their lives in the colonies had as much to defend as anyone born there.

George Taylor was born in Northern Ireland, emigrated to Pennsylvania and became an iron manufacturer before entering politics. Like Smith, he signed the Declaration as a Pennsylvania delegate. His story — from Irish emigrant to signatory of one of the most consequential documents in world history — is a thread that runs through the experience of the Irish diaspora in America.

Charles Carroll of Carrollton, while born in Maryland, came from a prominent Irish Catholic family with deep roots in Ireland. He became the only Catholic signer of the Declaration of Independence and its longest-lived, dying in 1832 at the age of 95. His family’s Irish connection was not incidental to his politics — the experience of Catholic exclusion in Ireland was a living memory in his household, and it informed his commitment to religious liberty in the new republic.

The Soldiers and Commanders Who Fought for the New Republic

The Irish contribution to American independence was not limited to the political realm. On the battlefield and at sea, Irish-born men played commanding roles that shaped the outcome of the war.

General Richard Montgomery

Richard Montgomery was born in Swords, County Dublin in 1738 and commissioned into the British Army before resigning his commission and emigrating to New York. When war came, he joined the Continental Army and rose to the rank of Brigadier General. He was killed leading an assault on Quebec in December 1775 — one of the first significant casualties among the senior leadership of the Continental forces. The Continental Congress ordered a monument erected in his honour, and he was mourned on both sides of the Atlantic. His birthplace town of Swords lies just north of Dublin Airport, making it one of the most accessible sites of Irish-American revolutionary history for visiting Americans.

Commodore John Barry — Father of the American Navy

Commodore John Barry is perhaps the greatest Irish figure in the story of American independence. Born in Tacumshane, County Wexford around 1745, Barry emigrated to Philadelphia as a young man and built a career in the merchant marine. When war came, he offered his services to Congress and commanded the first successful capture of a British naval vessel by an American warship. He served throughout the war with distinction and went on to become the first officer commissioned by President George Washington as Commodore in the newly established United States Navy.

A bronze statue of Barry stands in Washington DC, and another in Philadelphia’s Independence Mall. His birthplace in Tacumshane, County Wexford is marked and the surrounding landscape of flat marshland and wide skies has changed little since the boy who would shape the American Navy grew up there. For anyone whose family roots lie in south Wexford, this is a journey worth making.

Hercules Mulligan — Spy in the Heart of New York

Hercules Mulligan was born in Coleraine, County Antrim in 1740 and became one of George Washington’s most effective intelligence operatives. Established as a tailor in New York City during the British occupation, Mulligan moved in British military and social circles — gathering intelligence about troop movements, planned attacks and British strategy — and passed information back to Washington’s network at critical moments during the war. On at least two occasions, the intelligence he provided may have saved Washington’s life. His story, long neglected in popular histories, has received renewed attention in recent years as historians reassess the role of intelligence in the Revolution.

The Ulster Scots and the Continental Army

Beyond the officers and commanders, thousands of Irish-born men served in the Continental Army’s ranks. Several regiments — including elements of the Pennsylvania Line — had heavily Irish compositions, and the soldiers they provided were among the Continental Army’s most experienced fighters. Many had served in European armies before emigrating, bringing military knowledge that the colonial forces needed badly in the early years of the war. The Scots-Irish communities of the backcountry were also among the most committed supporters of independence, and their contribution to the battles of the southern campaign was decisive.

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The Irish Contribution to American Independence: Why 2026 Is the Year to Visit

The 250th anniversary of American independence is being marked with commemorations across the United States and in Ireland. Tourism Ireland and various government and cultural organisations are placing the Irish-American connection at the heart of this anniversary — recognising that the story of Ireland’s role in the founding of the United States is one of the most compelling draws for the tens of millions of Americans who claim Irish heritage.

For diaspora visitors, 2026 is not just a good time to visit Ireland. It is arguably the most meaningful time in a generation. The thread that connects your own family history to the founding of the United States may well pass through a parish in County Wexford, a street in Limerick or a farm in County Antrim. Coming to Ireland to trace that connection — to stand in the landscapes that shaped the people who helped shape America — is a journey with a particular resonance in this anniversary year.

Where to Follow the Trail in Ireland

• EPIC The Irish Emigration Museum, Dublin: A modern, immersive museum dedicated to the story of Irish emigration and its global impact. An ideal starting point for understanding how Irish people shaped the world — including revolutionary America.
• Tacumshane, County Wexford: The birthplace village of John Barry, Father of the American Navy. The landscape is quiet and rural, deeply evocative of the world that produced one of America’s founding naval heroes.
• Swords, County Dublin: Birthplace of General Richard Montgomery, a short drive north of Dublin Airport. A natural first stop for anyone following the trail of Irish-born Revolutionary War commanders.
• County Antrim: The heartland of the Ulster Scots emigration and birthplace of Hercules Mulligan. The Antrim coast and glens were the landscape that shaped many of the men who would eventually fight for American liberty.
• The National Archives, Dublin: If your own family’s emigration links to the 18th century, this is where you can begin tracing the records. Genealogists working here have helped thousands of families establish their Irish connections.

Planning Your Heritage Journey

The best way to explore the sites of Irish-American revolutionary history is by car — the places are spread across the country and public transport will not reach them. Our guide to renting a car in Ireland from the USA covers everything you need to know before you book, from automatic transmission availability to driving on the left.

For planning a route that takes in Dublin, Wexford and the south, our 7-day Ireland itinerary from the USA provides the framework. If you want to extend the journey north to County Antrim — following in the footsteps of Hercules Mulligan and the Ulster Scots — our 10-day Ireland itinerary for American travellers builds in that northern arc.

Spring and autumn are the finest seasons for heritage travel in Ireland. The roads are quieter, the light is softer and you won’t be competing with peak-season crowds for space at the sites. Read our full guide to the best time to visit Ireland from the USA to match your trip to the right moment in the year.

Begin Your Journey

The Irish contribution to American independence is not a footnote — it is a central thread in the founding story of the United States. In this 250th anniversary year, there has never been a better moment to cross the Atlantic in the other direction and stand in the landscapes that shaped the people who helped shape America. Start planning at our Ireland trip planning hub, and let the trail lead you somewhere you weren’t expecting.

Secure Your Dream Irish Experience Before It’s Gone!

Planning a trip to Ireland? Don’t let sold-out tours or packed attractions spoil your journey. Iconic experiences like visiting the Cliffs of Moher, exploring the Rock of Cashel, or enjoying a guided walk through Ireland’s ancient past often sell out quickly—especially during peak travel seasons.

Booking in advance guarantees your place and ensures you can fully immerse yourself in the rich culture and breathtaking scenery without stress or disappointment. You’ll also free up time to explore Ireland’s hidden gems and savour those authentic moments that make your trip truly special.

Make the most of your journey—start planning today and secure those must-do experiences before they’re gone!