Countries that sided with Germany in World War 2 was Italy, Japan, and most people don't know but Sweden did trade with the Germans during world war 2. Sweden did not partake in ww2 but they continued trade with the Germans, Italy joined the war because they sought out land and colonies, Germany wanted to undo what the treaty of Versailles did and japan wanted to rule the pacific. The United States sided on both wars with the Entente who helped France and Russia fend off against Austria-Hungary and Germany. The United States joined after the Sinking of the Lusitania.
The answer to your question is true.
The first true victims of American Imperialism were the Native Americans. As settlers slowly pushed West, native peoples were killed, forced out, or forced to assimilate into White American culture. Land would be set aside to "house" these many peoples, but even that would soon be settled. Native lands were slowly chipped away until they look as we see them. Many groups went from hundreds of thousands of miles of territory to a few hundred acres. Sometimes the land they were "given" wasn't even in their ancestral homeland, but thousands of miles away. Around the same time Americans would rob many Mexicans of the lands that they had settled and farmed for generations.
There were many significant political changes which Diocletian enacted. One important thing which happened was that he divided the Roman empire into two parts. This meant Rome was being effectively taken care of by two different emperors at the time for that reason.