This July 24, 2013, file photo shows demonstrators rallying for immigration reform in front of the White House in Washington. Obama had demanded action on a sweeping change in the law that would have given millions of immigrants illegally in the United States a path to citizenship while boosting spending on border security. When Republicans balked, he threatened to act on his own. But now the White House says it’s focused on stanching the influx of border crossers and returning as many as quickly as the government can. (AP Photo/Evan Vucci, File)

America’s immigration debate: A Q&A

The sudden rise in the number of families and unaccompanied minors from Central America crossing the border has dramatically redefined Ameri…