You're talking about World War II, right? Well, yeah, at one point Germany attempted to invade the Soviet Union (specifically during the Battle of Stalingrad.) But a major stumbling block was the weather in the Soviet Union; it was fiercely cold and German soldiers were starving and sick. Eventually, it became so cold that the German military retreated and Hitler's plans for "world domination" officially ended.
Northerner used the term slave power to criticize white southerners who practiced obsessive political power.
The in great need of troops, but because of segregation they missed the opportuity to get recruitments from other troops.
Barrages and Dams were built to manage the Euphrates river. I hope this answer helps.