Where did most immigrants come from in the 1840-1850s? What push and pull
factors contributed to the increase in immigration?

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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