<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the "railroad," since rail travel allowed for people and supplies to move to the west at an unprecedented pace. </span></span>
The economy is 3.4 trillion
The treaty of Versailles aimed to crush Germany and to not allow it to rise up and ravage Europe in war again but it didn't plan for the economic problems that the Weirmat Republic had to face. It also didn't help with the matter of fact that Germany had been ruled by a monarch for a good couple hundred years so many political figures didn't know how to make a functioning Democracy.
Americo Vespucci is the explorer who explored it and deemed it a new continent