In 3-5 sentences, evaluate if the United States has been a leader in the global economy in recent decades.

Over the past few decades, the world has been a witness to the drastic development both in the economic and social aspect. Over the years, the American society has not only seen the national economy doubled but tripled itself. According to the status, at present the business policies and the foreign capital finances have to maintain their present growth in order to see a much more positve and greater impact on the economy.