Frontier Footprints: A True History of the Rocky Mountains by Amy Kathryn Allen

Previously

…He felt a pang of something akin to regret, a fleeting awareness of the profound changes his presence, and the presence of all those who would follow, would bring. The mountains, in their silent grandeur, had issued their first call, a summons to adventure and discovery. But as the scent of woodsmoke mingled with the nascent tang of ambition, it was becoming clear that this call would also echo with the sounds of disruption, of displacement, and of a wilderness forever altered. The age of exploration had begun, and with it, the slow, inexorable march of humanity into the untamed heart of the Rockies.