I think it's D. The use of farming to feed a larger population.
I believe its checks and balances but I may be wrong
Answer:
What are the choices
Explanation:
You have not completed the questions because you have not shown the possible answers. Therefore, I cannot submit an accurate answer.
Ok, had to flip some pages but the two rivers were the Nueces river and the Rio Grande river
Crossing a European border required neither paperwork or government approval