Were Americans welcoming to Irish immigrants

Not really

Explanation: The Irish were a majority immigrant group, which means that they were generally disliked by the common American. They were a totally different religion than most Americans (they were Catholic, not Protestant like most Americans). They were so disliked by some that a political party, the American Party, was formed. Nationalists (people who supported an all-American country with no immigrants) formed this party in retaliation to the growing immigrants numbers, especially in retaliation to the Irish and the German peoples.

no infact according to the internet the irish were the most feared terrorists