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?

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

1.d 2.a c.!