President Trump signed a proclamation to ban travel from certain countries, citing national security risks. It's set to take effect at 12:01 a.m. Monday.

When President Donald Trump announced his new and expanded travel ban this week, the list of countries facing restrictions exhibited few obvious through lines. A closer look, though, reveals that many of the countries are united by a harsh recent history of civil war or armed conflict.

A sweeping new travel ban on citizens from a dozen nations was announced by the White House on Wednesday, reviving a defining effort from the first Trump administration to crack down on entries from specific countries.