Excerpt from The Oregon Trail by Rinker Buck, plus links to reviews, author biography & more

My curiosity was aroused by another detail that Duane shared. Pulling from his wallet a laminated ID card, he told me that he was a twenty-five-year member of the Oregon-California Trails Association, the main preservationist group for the trail. Duane described himself as a "rut nut," and his commitment to the group was pretty typical. Over the past twenty years he had rescued several Oregon Trail markers and monuments that had been overrun by farming and other development, relocating them closer to traveled roads where they could be seen. He had helped design and build a visitors' center at the Hollenberg Ranch and created Oregon Trail education programs for local schools. An Oregon-California Trails Association newsletter that Duane gave me described how the group's volunteer work crews fanned out on summer weekends across broad expanses of the West, restoring mile markers along the trail, checking fence lines for land encroachments, and preserving trail grave sites in Wyoming and Nebraska.

Feelings of inadequacy overwhelmed me as I listened to Duane. I am an obsessive-compulsive reader and a history junkie. I brake by rote at every historical marker, I buy out museum bookstores, and for years my interest in colonial forts and Shaker villages so exhausted my two children that they are now permanently allergic to the past. I can tell you, right down to the hour, everything that happened at Gettysburg, Pennsylvania, during the first week of July 1863, and each setback that Franklin Roosevelt endured during World War II feels like it happened to me. Frequent summer junkets to Montana and Wyoming had convinced me that I knew a lot about the American West. But now, on a perfect Kansas day, at an exquisite historical site, I was listening to a rut nut empty his brain on the Oregon Trail, and I realized that I didn't know a thing about it. How could I have missed so much about so iconic an American experience?

And what Duane told me next seemed even more astonishing. Today, almost the entire 2,100-mile expanse of the Oregon Trail—even where it has been covered over by modern highways or railroad tracks—has been meticulously charted and marked, with long, undeveloped spaces now preserved as a National Historic Trail. Except for two bad stretches of suburban sprawl around Scottsbluff, Nebraska, and Boise, Idaho, most of the rest of the trail is still accessible along remote farm and ranch roads in the West. In western Nebraska and central Wyoming, where the trail runs through relatively undisturbed federal lands or immense private ranches, there are still more than six hundred miles of original wagon ruts, just like the path I had hiked that day. The dreamscape chain of natural landmarks and river views that the pioneers saw—Signal Bluff and Chimney Rock along the Platte, Devil's Gate on the Sweetwater, Rendezvous Point at the Green—is all still there, virtually intact.

When Duane began describing the trail, he handed me a foldout map published by the National Park Service, and I followed along as he spoke. End to end, the map stretched almost four feet across the counter, depicting an immensity of terrain, almost completely devoid of urban development, from the banks of the Missouri River at Kansas City to the end of the Columbia River gorge near the Pacific coast. The colored terrain shadings on the map looked like platters holding a giant smorgasbord of geology—plains, bluffs, high desert, and dramatic river gorges—along the route west. To me, the Oregon Trail had always been just another historic nameplate, like Manassas or Pikes Peak, but now the map in front of me was opening it up like a tableau of the enormous energy of the American experience. The visual prompt of the map was irresistible, and I formed a strong mental image as I looked out through the paned windows to the endless plains beyond the groves of cottonwood trees that curled along the floodplain of the Little Blue River. In my mind's eye, a dusty two-track trail curved northwest into the mystery of Nebraska, and then disappeared into the snowcapped rim of Wyoming's Medicine Bows.

Excerpted from The Oregon Trail by Rinker Buck. Copyright © 2015 by Rinker Buck. Excerpted by permission of Simon & Schuster. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.