The two political parties appear to be moving farther apart than ever on immigration issues. President Obama and other Democrats want to offer people who entered this country illegally more protections and perhaps benefits. Republicans are more mixed on the issue, but most members of the GOP want to toughen border security and enforcement of immigration law. They claim, in fact, that Obama has far exceeded his authority on the issue. Meanwhile, even as the debate remains rancorous, the number of immigrants has stagnated. China and India now send more newcomers to the United States than Mexico, but the nation faced a crisis last year with unaccompanied children from Central America arriving by the thousands.