Most immigrants came from Ireland due to the potato famine.
Explanation:
One of the most devastating things to happen to Ireland was the potato famine where millions of people died of starvation in a famine tat was largely avoidable but the British did not do anything about it.
A huge stretch of the population thus decided to move away from the nation to settle for better prospects and the majority chose US.
The US thus became swarmed with migrants from Ireland on its shore that wanted sanctuary.
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"Like other settled, agrarian societies in history, those in the Indian subcontinent have been attacked by nomadic tribes throughout its long history. In evaluating the impact of Islam on the sub-continent, one must note that the northwestern sub-continent was a frequent target of tribes raiding from Central Asia. In that sense, the Muslim intrusions and later Muslim invasions were not dissimilar to those of the earlier invasions during the 1st millennium."
<span>Richard M. Frye, "Pre-Islamic and Early Islamic Cultures in Central Asia", in </span>Turko-Persia in Historical Perspective<span>, ed. Robert L. Canfield (Cambridge U. Press c. 1991), 35–53.</span>"
So, MUSLIMS is the answer, does it have this option?
I am not so sure what you mean by "what kinds of unions were formed", but if you're talking about the Civil War then I think the unions were Confederate and Union. The Confederates wanted to run the country with slavery while the Union fought against slavery. Do not quote me on that though.
