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.

Here is a closer look at why the administration says it is instituting full bans on foreign nationals traveling to the U.S. from 12 nations.