Here is a list of answers assembled by u/dinocrocodile

How did Ethiopia avoid colonization? by /u/snackburros and /u/commustar

How did Ethiopia remain independent for so long and then gain support from other colonial powers? by /u/khosikulu and /u/ThoughtRiot1776

Ethiopia stayed independent during the 19th-20th C European colonization of Africa. What enabled it to stay autonomous? by /u/lakerman1495, /u/khosikulu, and /u/guerrier_papillon