Millions of Americans carry a second nationality without ever really thinking about it, whether through a parent’s birthplace, a grandparent’s old passport, or a marriage certificate tucked away in a drawer. What’s changed lately is how many people are actively going looking for that second passport instead of waiting to stumble across it. Rule changes in Italy, Canada, Portugal, and elsewhere over the past year have reshuffled which countries are actually worth the paperwork, and a few names keep coming up for good reason.
Ireland
Ireland remains one of the most approachable options for Americans with European roots, largely because the eligibility rule is so clean. Irish citizenship can be acquired by descent, birth, or naturalization, making it one of the most accessible European options for Americans with any Irish family history, since no move abroad is required just to qualify by ancestry. An estimated 30 million Americans claim Irish descent, which gives a huge slice of the population at least a shot at eligibility.
The country grants access through a grandparent’s birth in Ireland via a formal registration process rather than an automatic grant, and you automatically qualify if a parent was born in Ireland, while if a grandparent was born there, you can claim citizenship by registering on the Foreign Births Register. Beyond the paperwork, there’s a lifestyle case to be made too, since Ireland ranks among the top 10 safest nations, with low crime rates and political stability. Add in full EU membership and it’s easy to see why this stays near the top of most people’s lists.
Italy
Italy used to be the golden ticket of ancestry citizenship, letting people trace back through great-great-grandparents with no generational cutoff. That changed abruptly in 2025, and the shift is worth understanding before anyone gets excited about a distant Italian relative. Law 74/2025, which converted Decree-Law 36/2025, officially limits citizenship claims to two generations, meaning parents or grandparents, and great-grandparent claims are no longer valid for new applicants.
The Italian Constitutional Court had a chance to walk this back in March 2026 and declined to. Through a press release, the Court declared the issues partly unfounded and partly inadmissible, thereby confirming the validity of the new rules on Italian citizenship by descent. That said, Italy still works well for anyone with a parent or grandparent born there, and interest hasn’t dried up given that more than 17 million Americans identify as being of Italian descent, according to the latest U.S. census.
Portugal
Portugal has quietly become one of the more strategic EU entry points for Americans, partly because of what the passport actually unlocks. The Portuguese passport ranks among the top 5 globally, offering visa-free or visa-on-arrival access to over 185 countries, including the entire EU/EEA, the US, Canada, Japan, and Australia. Naturalization has traditionally run through five years of legal residency, often via the Golden Visa program.
That timeline is currently in flux. As of April 1, 2026, Portugal’s parliament approved a change extending the time it takes investors to get Portuguese citizenship from five years to ten, though investors will still acquire permanent residency after five years, and the law had not yet gone into effect as a decision was expected before June 2026. Investment thresholds have stayed relatively modest, with options as little as €250,000 to supporting the arts or preserve national heritage sites or €500,000 in a research or development opportunity.
Poland
Poland tends to fly under the radar compared to Ireland and Italy, but it’s arguably the most generous ancestry route left standing in Europe. There’s no hard generational cap, which matters a great deal now that Italy has closed that door. Poland allows great-grandparent claims, whereas Italy legally terminated great-grandparent eligibility under Law 74/2025.
The requirement centers on an unbroken chain rather than a fixed number of generations. Poland recognizes citizenship through an unbroken chain from an ancestor who held Polish citizenship after 1920-01-31, with no generation cap, provided every link remained unbroken. Given that nearly 10 million Americans identify as being of Polish descent, this is a route worth checking even for people who assumed Italy or Ireland were their only shot.
Canada
Canada made one of the biggest changes in this entire space over the past year, and it caught a lot of eligible Americans by surprise. On December 15, 2025, Bill C-3, An Act to amend the Citizenship Act, came into force, amending the Canadian Citizenship Act to no longer limit citizenship by descent to the first generation born abroad. That single change opened the door for a much larger pool of applicants.
For Americans specifically, the practical effect is significant. Under the new legislation, Americans can claim Canadian citizenship through a grandparent, since the law creates a retroactive chain of descent where if your grandparent was born in Canada, the law restores your parent’s citizenship, making you eligible as the child of a Canadian citizen, provided you were born before December 15, 2025. There’s also a tax upside that’s easy to overlook, since Canada’s tax system is based on residency rather than citizenship, so an American who obtains Canadian dual citizenship but continues living in the United States won’t owe Canadian income tax.
Mexico
Mexico’s appeal has less to do with ancestry and more to do with proximity, cost, and a straightforward legal framework. There’s essentially no friction between the two countries on this front. Mexico and the United States both let people be citizens of both countries at the same time, with no problems or limits.
The naturalization path is also faster than most people expect. Mexico fully permits dual citizenship and offers a relatively accessible path to naturalization after 5 years of legal residency, reduced to 2 years if you have Mexican-born children or a Mexican spouse. Combined with a territorial tax system that does not tax foreign-sourced income of non-residents, Mexico has become a practical option for retirees and remote workers who want legal permanence without cutting ties to the US.
Argentina
Argentina keeps showing up on shortlists because its naturalization timeline is genuinely unusual by global standards. Argentina offers one of the fastest naturalization processes in the world, taking only 2 years of residence to become eligible for a passport. Spanish fluency isn’t heavily emphasized either, though applicants will need to be able to hold a basic conversation in Spanish.
There’s also something new brewing that could make Argentina even more attractive to people without years to spare. In 2026, Argentina plans to launch a citizenship by investment program, and the respective law has already been published, though it doesn’t yet describe investment options and the required contribution amounts. Until those details firm up, the residency route remains the clearest path, and it comes with the reassurance that Argentina permits dual citizenship, so US citizens can usually retain their American nationality after naturalization.
Greece
Greece offers a rare combination for Americans of Greek heritage: EU citizenship, a lower cost of living than much of Western Europe, and a descent program that reaches back further than Ireland’s does. Greek Citizenship by Descent allows individuals with a parent, grandparent, or sometimes even great-grandparent to acquire citizenship, with a processing time of approximately 12 to 24 months and no residency requirement.
For those without documented ancestry, naturalization is still on the table, though it takes longer and comes with more conditions than the descent route. The country’s overall value proposition holds up well against other EU options, summarized fairly by the observation that Greece offers full EU membership, citizenship by descent available for those with Greek parents, affordable cost of living. That mix of accessibility and lifestyle is hard to match elsewhere in southern Europe.
Grenada
Grenada sits in a different category entirely, since it’s not about ancestry or years of residence but about a direct investment. It’s also the only Caribbean program with a specific feature that draws American interest for an unusual reason: it can eventually lead back into the US. Grenada is the only Caribbean CBI country whose citizens can apply for the USA E-2 Investor Visa, though applicants who obtain treaty nationality by investment must be domiciled in the treaty country for at least 3 continuous years before filing.
The entry cost is comparatively modest for what it delivers. Grenada offers investors and their families a pathway to citizenship through a qualifying economic contribution, with investment options starting from $235,000, providing greater global mobility, the possibility of pursuing a US E-2 Visa, and the option to include eligible family members in a single application. There’s no relocation requirement either, since neither a visit to Grenada nor a stay are necessary prior to or following citizenship, and the tax picture is clean given that Grenada is a tax-efficient jurisdiction for international investors because it does not charge taxes on worldwide income, capital gains, inheritance, or wealth.
Weighing the options
No two of these nine paths look alike, and that’s really the point. Ancestry routes like Ireland, Poland, and Greece cost little beyond time and paperwork, while Italy’s tightened rules mean many hopeful applicants will need to check their exact generational link before spending money on genealogists. Canada’s December 2025 reform quietly reopened a door that had been shut for over a decade, and it’s worth a second look even for people who assumed they’d missed their chance.
Investment-based citizenship, as with Grenada, trades time for cost and suits a different kind of applicant altogether. Whatever the route, the one constant across all nine countries is that the US allows its citizens to hold a second passport without giving up the first, so the real homework lies in the other country’s rules, not Washington’s.
