Immigration drastically increased in the United States during the period between the Civil War and the early 1900s. This immigration boom coupled with increased development and industrial output following the Civil War led to large economic growth in the United States as well.
It left the entire west in ruins, basically the reason for feudalism and the Dark Age
Answer is D.
Germany out of those 4 countries had the most dramatic territorial changes during that time period.
The Populist Party spoke for farmers and laborists