There was trails all across The U.S. There was also coming from the other side of the world. lolz. And also walking I guess.
Poland. Just learned about this, and as far as I know Britain, France, and Italy all benefited from it
The German economy was especially vulnerable since it was built upon foreign capital, mostly loans from America and was very dependent on foreign trade. When those loans suddenly came due and when the world market for German exports dried up, the well oiled German industrial machine quickly ground to a halt.