Allow import of a list of data for a drop down list

Idea created by Nour Nour on Oct 29, 2015
    • Philippa Grover
    • B_Canales
    • Nour Nour
    • Vince Outlaw
    • Günter Swatschina
    I want to import a file for a drop down list. My drop down list is a set of nationalities: American, German..etc I want to import a file ( I can simply get it online not a big deal or create it) to make a drop down list of nationalities.
     I went to drop down editor then I did not have the option for importing a list of items. 
    I do not want to add drop down items manually. This will take a lot of time. Help.