Country tag for Mexico is:
MEX
If you want play for Mexico HOI4 you could use tag command:
tag MEX
To annex Mexico in HOI4 you could use annex command:
annex MEX
To delete all Mexico units you could use deleteallunits command:
deleteallunits MEX
To add interests on Mexico you could use add_interest command:
add_interest MEX
To remove interests on Mexico you could use remove_interest command:
remove_interest MEX
To start occupation on Mexico you could use occupationpaint command:
occupationpaint MEX
More country tags for HOI4 or more cheats for Hearts of Iron IV