The diversity visa lottery was an obscure program described as a quirk in the U.S. immigration system before this week's terror attack in New York that left eight dead and sparked diversity visa concerns at the highest levels. That all changed when it was reported that the New York City attacker, Sayfullo Saipov, 29, came to the United States legally in 2010 from Uzbekistan through the diversity immigration lottery visa program. President Donald Trump immediately pledged to abolish the pro...