What was the primary cause of the changes to the unemployment rate in the united states in 1920 and 1921?

The Bolshevik victory in the Russian civil war. I hope this can help. ^^

The effects of demobilization was the cause

the answers is b.   environments.

it's a secular holiday. it is and was a custom developed to recognize the ending of a time and a wish for a good future. the kind of kiss you exchange, if you are single, is intended to predict what kind of year you will have in the coming year.

it is saying good bye to the last year with all its ups and downs, and hello to the new year, with all its hopes and dreams.