By 3400 BC what is the staple crop? *

New World crops are those crops, food and otherwise, that were native to the New World (mostly the Americas) before 1492 CE and not found anywhere else at that time. Many of these crops are now grown around the world and have often become an integral part of the cuisine of various cultures in the Old World. Notable among these crops are the Three Sisters: maize, winter squash, and climbing beans.

from the conditions of the working class in england by friedrich engels,the main idea is :

manchester's leaders hoped to oppress its working class to benefit factory owners.