The number of people increased because people were immigrating to germany to get away from violence
Okay, so, just from the top of my head, I think that it is because of the growing belief of "Manifest Destiny" in the nineteenth century. I'm not sure if this is the actual right answer for your question, but I do know that Manifest Destiny was in the nineteenth century and was the widely held belief in the USA that American settlers were destined to expand through out the continent. And I think both the USA and Europe wanted to expand, it was kind of a copetition/conflict they had. This was actually how Canada and Alaska came to be I believe. This was a simple explanation btw. cx
The most logical place in Europe for the D-Day invasion was France's Pas de Calais region, 150 miles northeast of Normandy and the closest point to Great Britain across the English Channel.
Don larson in 1956 i think
The traffic increased as a result of the Louisiana Purchase
