In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The Eighteenth Amendment to the Constitution had started a period in the US known as Prohibition .
The Eighteenth Amendment to the Constitution had ushered in a period known as Prohibition , during which the manufacture , distribution , and sale of alcoholic beverages was illegal .