Answer:
The cause of the brief recession was the end of World War I.
Step-by-step explanation:
That recession is known as the post-World War recession, it hit the entire world when the war came to an end. It greatly affects Europe but in the United States, the effects were much more diminished.
The economic growth of the country had increased during the years of the War because of the battle fought in Europe and the lack of production in that continent. When the War ended the global economy began to decline but it did not affect so much the United States the second part of 1919 saw a recovery.
I hope this answer helps you.