<span>A guru
This is the answer</span>
The Great Depression is an effect of the stock market crash
The US prairies or Great Plains included a large north-south swath of level or slightly rolling grasslands east of the Rockies from central Texas to Manitoba in Canada and included at least parts of Montana, Wyoming, /Colorado and New Mexico, North Dakota, S. Dakota, Nebraska, Kansas and Oklahoma.
I’m not sure, but I guess The British?