the economic progress that the U.S, question help

Despite the economic progress that the U.S. has observed in the past century, the standard of living remains extremely low in many countries. Consider the following regarding poverty in developing countries:
• Why are some countries relatively wealthy while others are not? 
• Consider some primary differences between countries. Which differences do you expect to affect economic growth and wealth? 
• Can you think of anything else that can help other countries to achieve economic growth? 
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150 words