What did europeans discover would happen if they planted potatoes instead of grain?

I think potatoes Europeans discovered that if they planted potatoes instead of grain that they could feed four times as many people on the same amount of land

How did European horses change the lives of the Native Americans?

Horses provided a faster way to travel around which let them start hunting buffalo for their main food source

I hope this help you!:)

b.

jim crow laws were enacted in northern states.

answer:

won re-nomination with no opposition he also had the support of his party

explanation:

it saw incumbent president andrew jackson, candidate of the democratic party, defeat henry clay, candidate of the national republican party. jackson won re-nomination with no opposition, and the 1832 democratic national convention replaced vice president john c. calhoun with martin van buren.