The statement that reflects a negative point of view on the Columbian Exchange is B, <em>Children, mothers, and even chiefs are no match for this unseen warrior</em>.
Explanation:
The text summarizes the changes in these societies caused by the start of the Columbiam Exchange in the 15th century. According to it the exchanged caused the destruction of these diverse societies by an unseen warrior".
This unseen warrior is probably the many diseases brought by the Europeans to the New World. As they were unknown in these lands, New World's population didn't have in their bodies tools to defend them from these diseases. This was one of the major causes of these societies' destruction.
Popular vote, in an indirect election, is the total number of votes received in the first-phase election, as opposed to the votes cast by those elected to take part in the final election.
After WWI and during the Great Depression the US tried to be an Isolationist nation. They put out tariffs so people would buy US (forgetting that the rest of the world was still devastated by WWI (economies included)).