This began to change in the 1840s,among the pool factors were the young country's industrialization and western expansion.

Here "the pool factors",what does that mean?

Question

This began to change in the 1840s,among the pool factors were the young country's industrialization and western expansion.

Here "the pool factors",what does that mean?

Answer

In this sentence, "pool factors" is likely a mistake. It should be "pull factors," which means reasons that attract people to a place, like jobs or opportunities. So, the sentence means that industrialization and western expansion were things that attracted people to the young country in the 1840s.

Answer

It doesn't make any sense to me. Also, the sense looks to be poorly constructed, i.e. that should be two different sentences.