At that time the resources and especially money is scarce since the economy is just starting to recover again after the war. The businessmen needs cash or capital to simply buy and sell goods or to start a business.
i hope my answer helped you.
C.It increased trade on the Mississippi
Answer
eventually returned to their home countries
Explanation
Many new immigrants entered in the US in the late 1800 in large numbers and most of them were from western and northern Europe. They fled to US because there was job shortage in their country and also crops farming failed due to their land being infertile and famine.There was also high taxation in their countries. Others were moving to US to seek for freedom due to the political and religion persecution. Many immigrants eventually returned to their home countries this is because in their mind they didn't come for a permanent stay.
Answer:
selling products for cash