The establishment of speakeasies in the 1920s was an unintended consequence of which federal government action

The 1920s were a time of highs and lows for the United States. More Americans were living in cities instead of farms, more people had money to spend, and the country became more united through music, dancing, and fashion. Citizens who weren't too happy with these changes wanted lawmakers to stop making and selling alcoholic beverages. They thought by not allowing people to drink alcohol, there would be less crime and people would be more likely to make good choices. The 18th Amendment was created to prohibit the creation, sale, or transportation of alcohol. Their plan didn't quite work out that way though. Bars and places to purchase alcohol were created in secret where Americans could illegally purchase alcohol. These were called 'speakeasies". These speakeasies came as a consequence of the addition of the 18th Amendment to the Consitution. This is also known as Prohibition. 

Ithink it is called reservation