Which crop from the new world provided nourishment to the growing population of europe, and eventually led to tragedy in ireland when people became overly dependent on it?

This was an order issued during the civil war by president lincoln ending slavery in the confederate states

Although china's total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation?

After the civil war, the freedmen's bureau was set up primarily to which group of people? a) former slaves b) northern factory workers c) confederate soldiers d) immigrants