In 1896, GermanyHenry FordModel TRoaring TwentiesMotor CitySelect your answer wheeled out his first automobile that ran on engine power. This was not the first vehicle powered by gasoline, however, it was the first to become successful. Within 12 years, his high-techmass productionModel TMotor CityGermanySelect your answer, or "Tin Lizzie," became the most popular automobile in the United States. In 1903, 57 automobile manufacturers opened in Detroit. Soon Americans were calling it "Henry Fordmass productionModel TGermanyMotor CitySelect your answer."

The booming automobile industry welcomed men from all over. Immigrants arrived from Poland, Motor CityModel TGermanyassembly lineHenry FordSelect your answer, and other parts of the world. Thousands of African Americans moved from the Southeast in search of work and equality. Group movement from one region to another is called assembly linemigrationGermanyRoaring Twentiesmass productionSelect your answer. So many African Americans made this journey during the early 1900s that it became known as the Great Migration. As years passed, the price for a Model T kept dropping because of assembly linemigrationModel Tmass productionGermanySelect your answer. Mass production means manufacturing large numbers of goods using identical parts. In 1913, Ford set up an high-techRoaring Twentiesrobotsmigrationassembly lineSelect your answer in his factory. This cut the assembly time of a Model T from 12 hours to 93 minutes. Today cars and many other products are built on assembly lines.

During the 1920s, millions of Americans enjoyed better living conditions than ever before. This period is called the "migrationMotor Cityassembly lineRoaring Twentiesmass productionSelect your answer." Since then manufacturing has changed a lot. Many tasks are now performed by mass productionassembly linerobotshigh-techHenry FordSelect your answer-- machines controlled by computers. New companies now build robots and computers. The mass productionassembly linerobotsmigrationhigh-techSelect your answer industry holds promise for workers in the future.