Let me make a proposal to turn over the economy, using some of the more than $ 48 billion to be sent outside the U.S. by immigrants to their countries. the purpose is to use in buying more than 18,000 houses that are currently in stock in real estate market and then begin a program of building new houses, to get this money here.
At page number the book in the link below, depicting that immigrants are sending from US $48.1 billons to their countries, although this amount is not a representative quantity in the US GDP, some of this money could be use in the economic revitalization, buying the stock houses around the country. One of the most important flows of money is the $48.1 billons, leaving from US.
http://siteresources.worldbank.org/INTLAC/Resources/Factbook2011-Ebook