Is St. Patrick's day a National Holiday for the Irish living in the US? Which countries have their own national holidays in the US?

There are no National Holidays in the USA. You could correctly say that St Patrick's Day is a major celebration of one ethnic group and the rest of the country celebrates along with it. It is easily the most widely and actively celebrated ethnic/national holiday.

The other immigrant groups never settled on a single day nor captured the imagination the way the Irish did. The Germans celebrate days in and around October, with most of the country having Oktoberfests of various sizes. The traditional German American day is Von Steuben Day in mid September after the Revolutionary War hero and there are parades in major cities.

The Italians celebrate both St Joseph's Day and Columbus Day as Italian American celebrations. The Mexicans and spanics are building up Cinco de Mayo into a major holiday that has grown in popularity in recent years. There are Greek celebrations around the country, usually in the spring; but, they are not tied to a particular day.

The Vietnamese and Chinese celebrate the Lunar New Year which has almost caught on among the rest of the country but not yet. Those are the only ones I can think of that are at all widespread.

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