It dried up.
North Africa used to be a fertile grassland, even swampy in some spots, 12,000 years ago. By 1000 BC (actually quite a while before) it had dried up into what is the the largest desert i the world: the Sahara.
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.
Is there a question? Although, I went ahead and wrote this here for you.
Buying started declining towards the end of the 1920's. The factories had to cut back when stores that had huge amounts of goods stopped ordering from factories. Even before the stock market crashed, large amounts of factory workers were laid off. When the recession arrives at last, even more people are risking their work and wealth.
