The growing of corn enabled the native Americans to have a much more reliable food source that was produced in large quantities and they also had reserves for bad times. This allowed the populations to grow significantly, and also larger cities to be built and developed. It also contributed that the people in this part of the world to have more time to focus on other things, like sciences, astronomy, architecture, instead of just living day by day and be in a constant search of food.
Ok so you could Read the question then go onto the text and find the information that answers it or is related to it hope this helps!
There are two interpretations of this:
1) It was a "gift" to Ukraine, marking the amicable relations between Ukraine and the Soviet Union, to bring them even closer
2) It made the Ukrainian Soviet Socialist Republic more ethnically Russian; which would shift the dynamics in it and tie it even closer to Soviet Union (And for example make it less likely that it would try to split )
