When St. Patrick’s Day rolls around March 17, the Irish have lots to celebrate.

Ireland is still clean and green. Now, it is spending $15 million to bring visitors back.

Irish tourism officials are targeting 35 million people living in the U.S. with Irish heritage. They are key to generating $3 billion in pre-coronavirus yearly revenue.

Ireland is an island nation roughly one-third the size of Washington state with 5 million people. It is no longer an agrarian country. Today’s Ireland attracts tourists, high-tech companies and manufacturers from around the world.

One of the keys to it...