I think the answer is C. Tell me if I’m wrong.
Answer:
People who traded with other people across the ocean could communicate much quicker.
Explanation
Seward’s Folly refers to the "<span>(C) United States’ purchase of Alaska," since this deal was made by William Seward, and was seen by many at the time as being a waste of money. </span>
A trade union protests their employers for better or improved working conditions, sometimes through strikes, picketing, etc.
The United States failed to provide adequate support.
