How do you make maps like this?

[Vampiresbane]

I'm wanting to make a map for the regions that trigger certain 7 Seven Cities events and I'm not sure if there's an easy way to do it. I would then share map to eu4 forums, but I'll be using it as well.

Anyone know how reference maps, like the above, are made?

 

[Mrkew]

If all you need is a blank map of the americas with all the provinces, then why don't you just take the picture from the wiki?

 

[Vampiresbane]

If all you need is a blank map of the americas with all the provinces, then why don't you just take the picture from the wiki?

Is there a completely blank map on the wiki?
Once I have that, how do I fill in particular regions or provinces?

 

[Imperator_Thrawn]

Yes, the wiki does have a completely blank map, and to fill it in, all you need is paint or any other image editing program.