Hello!
I think you are missing the situations, but if are the following:
A) the passage of the Fugitive Slave act of 1850
B) ...
C) ...
D) the argument against the expansion of slavery in the Wilmot Proviso of 1848
Then, the answer is D. the argument against the expansion of slavery in the Wilmot Proviso of 1848
Hope this helps :)
It had a very positive impact because the 1920's was when many new technologies were introduced, one example being the the assembly line, which made many industries more productive and profitable.
Hope that helps!
The reason why some nations were more prosperous and were faster to acheive economic prosperity was due to multiple reasons. Some have had multiple and violent military coups which obviously played a big role in their violent transitions. Other experienced violent civil wars because different cultures had to live together. These two things both played a very important devastating role in the violent transitions.
What could have been done would have been that they would redraw the borders.