Developments of cities overhauls of transportation and Communication systems increased immigration technological innovations and comprehensive changes to labor and corporate law
They only had to pay passages across Atlantic ..
"Red Army" is slang, I believe
The significance of military action in WWII is that without taking this necessary action, (assuming you are referring to the U.S.) WWII could have had a very different outcome. The U.S. involvement in WWII was the cause of the bombing of Pearl Harbor. If they hadn't formed the Allied Forces to defeat Germany and Hitler, Germany very well might have won.
