Which invaders of the roman empire came from the farthest eastern point?

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

Why was there so little resistance in the war from the german people?

How did the us change it’s economy to provide supplies for the war effort?