According to the second material, the historical question analyzes how the American economic structure has changed.

1. "One high and two low" phenomenon, that is, economic growth, low inflation and low unemployment rate;

2. Sustained economic growth;

3. Real personal consumption and fixed capital investment grew rapidly;

4. The government's macro-control policy has changed.

Economic reform measures in the United States in 1990s;

1. Reform the social economy;

2. Strengthen the development of education and science and technology, and promote the development of high-tech represented by the information industry;

3. Complete the technological transformation of traditional industries.