How to punch a question by default based on previous question selection

Instead of making the Region an actual question, I would just make it an Embedded Datafield that you can can use Branch Logic in survey flow to set based on the Country entered by the respondent. This will still be a variable in your datafile so you can do analysis on it without having to technically ask it, or have a question for it that fills in by default.

Here's some resources from Qualtrics you may find helpful.
This explains Branch Logic: https://www.qualtrics.com/support/survey-platform/survey-module/survey-flow/standard-elements/branch-logic/
This explains Embedded Data: https://www.qualtrics.com/support/survey-platform/survey-module/survey-flow/standard-elements/embedded-data/ (The section setting values in survey flow is probably most helpful to you)