Rivalry
Colonial and imperialistic ambitions was a major contributor of rivalry and hostility that beheld western Europe in the decades before ww1. Each of the nations was seeking to out do each in strategic colonies such as Egypt, east africa,India and some provinces in Europe such as Alasce and Lorraine.
The Senate ratifies treaties and approves presidential appointments while the House initiates revenue-raising bills. The House initiates impeachment cases, while the Senate decides impeachment cases.
In general, yes it is true that many Americans questioned this, but it was necessarily that it was because they thought that Puerto Rico did not serve a strategic importance, but because it was very expensive to maintain at the time.
Operation Reinhard was started when the Russian leaders came together and discussed a plan to exterminate the Jews in Europe. When Germany was given control of Poland, they advanced the plan to build extermination camps to kill all the Jews living in Poland.