Climate is the long-term weather pattern in a particular region. The weather can change from hour to hour, day to day, month to month or even year to year. However, over periods of years or more, distinct weather patterns occur. A desert may experience one rainy week, but over the long term the region receives very little precipitation. The Roaring Twenties were a period in American history marked by dramatic social, economic, and political changes. For the first time, more Americans lived in cities than on farms. The nation's total. The Great Migration was the movement of more than millions of black Americans from the South to cities in the North, Midwest, and West, from America's busiest oil industry. Prices are high enough to generate profits, or even more. But instead of lashing out, the producers aimed for something new: discipline. The accidental retirement revolution began when Congress decided to change the tax code with the Revenue Act. 1978: Congress passes the Revenue Act, including a provision. Climate change is the long-term alteration of Earth's climate and weather patterns caused by human activity. It took almost a century of research and data to convince the vast majority of people. Big visualization provides a long-term perspective on the history of technology. 1. The timeline starts at the center of the spiral. The first use of stone tools, 3 years ago, marks the beginning of this history of technology. spiral tower, by Paul Sancya AP. Faced with a housing shortage, the federal government launched a program explicitly designed to increase and segregate America's housing stock. Author Richard.