File photo of demonstrators waving Mexican and the United States flags at a protest near downtown San Diego

 
File photo of demonstrators waving Mexican and the United States flags at a protest near downtown San Diego
Demonstrators wave Mexican and the United States flags and cheer at a planned protest near downtown San Diego, California in this May 1, 2006 file photo. An April 2012 report finds that the largest wave of immigration in history from a single country to the United States has come to a standstill. After four decades that brought 12 million current immigrants - more than half of whom came illegally - the net migration flow from Mexico to the United States has stopped - and may have reversed. REUTERS/Fred Greaves/Files (UNITED STATES - Tags: CIVIL UNREST POLITICS SOCIETY IMMIGRATION)