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The United States once had an era of corruption, with corruption emerging endlessly and ordinary people losing confidence. What methods have Americans found to curb corruption? There was an era in the United States that was rich in nouveau riche. Rich people rushed to burn money and made people jealous. How did Americans get rid of the image of nouveau riche and lead global innovation? There was an era of counterfeiting in the United States. Poisoned rats were mixed into meat grinders; hand-washing water was mixed into seasonings... People were worried about food safety. How can Americans make food safe? There was an era of environmental destruction in the United States. The land was ravaged and the pollution was shocking. How did Americans regain blue skies, white clouds and fresh air? The United States once had an era of "keeping a low profile". Even when Japanese warships were equipped with modern equipment, the U. S. Naval fleet was still made of wood. How did Americans establish their dominance? This book tells us that the United States also encountered serious bottlenecks. It overcame it and became the world's hegemon. Instead of being envious and jealous, it is better to learn from what it did in that era. A detailed explanation of the United States 100 years ago. Provide real historical reference for the Chinese Dream.