It could be argued that by the Fall of 1940, Germany controlled "about half" of western Europe, since by this time it had already succeeded in taking over large amounts of land, such as Poland.
The answer to this question is option "D" or "the spread of mass-production techniques.. I hope my answer has helped you.. good day to you..
There were many important Union generals during the American Civil War. ... Union Army during the later years of the civil war, and later became the President of The United States.