The twenties and the thirties were very unusual time periods in American History. In some ways they are alike, but in most ways they are very different. The twenties were a time of fun and partying. This is probably the reason it is called the Roaring Twenties. All of the thirties were known as The Great Depression. It was probably called that because of the stock market collapse and the millions of people without jobs. In the twenties, industry took a very big step. The automotive industry was the largest industry there was. The assembly line ....