alternatehistory.com

The scenario is this: great apocalypse-like disaster occurred in Europe. It was so bad many Europeans thought their land is doomed and wanted to get out of it. Their destination? The lands beyond the western oceans.

Fast forward, these migrants settled in the Americas, and formed their own new states.

How is this possible? What are the requirements to make this happen? When are the most possible timeframe for this? I can only think of Black Death and a highly successful and brutal Mongol conquest.
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