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Updated September 11, 2014

President Obama listed infrastructure as one of the key investments to the United State's long-term economic growth and its ability to be a world leader. However, by some estimates from 2006 and 2007 data, the U.S. government expenditure on infrastructure recently dropped to about 2.4% of its GDP, while Europe spends 5% of its GDP and China spends about 9% of its GDP in this sector.

Infrastructure Research Links are divided into: