What other factors might cause a mass migration similar to the irish immigration of the mid-1800s?

Can someone read this article and tell me the 1) key ideas and 2) one key quote (copy and paste the link the article is not to long at all)from

Which idea is central to democracy in the united states? everyone has an equal right to consumer goods. people should not compromise to settle differences. the minority has authority over the majority. freedom must be balanced with respect for the law.

17 points! ! (explain your answer)