The correct answer is the Storming of Normandy.
This military campaign by the Allied forces against the Axis powers was the largest air and sea attack during World War II. The ultimate goal of this military invasion was to gain control of France since, at the time, the country was under control of Nazi Germany. This was an iconic moment for the Allied powers, as they were able to free France from Nazi German rule.
The greatest change in the West that was brought about by railroad expansion was a drastically increased population size, since people could now claim land and travel far more easily.
