Major towns are RED
Indian Nations are BROWN
Rivers are BLUE
Geographical Regions are GREEN
The rivers look different here than on a modern map because this story takes place approximately 80-90 years before the rivers were dammed for hydroelectric plants. Those large lakes you can see on modern maps are artificial in other words.
I've tried to strike a balance between "vintage" looking and readability. Please, if you have trouble reading this, email me (arkiv2001 at gmail.com) and I'll upload a cleaner version!