I can expand Dr. Doom's list of potential disasters

Four Collision Courses for the Global Economy

Between US President Donald Trump's zero-sum disputes with China and Iran, UK Prime Minister Boris Johnson's brinkmanship with Parliament and the European Union, and Argentina's likely return to Peronist populism, the fate of the global economy is balancing on a knife edge. Any of these scenarios could lead to a crisis with rapid spillover effects.

Add the Iraqi rebellion which may have a greater impact on the Middle East than Trump.
Add the Hong Kong revolt which may pull China GDP far down.
Add the potential collapse of California, a bigger threat than Argentina.
Add a violent, failed state on our southern border.
Add the potential for Yellow Vesters in France to grow their movement into a majority.
Add a potential collapse of Italy and the end of the Euro.