The railroads in the east connected ports on the Atlantic Ocean and went as far west as Iowa. From there to Sacramento was over 1,900 miles of American MidWest—territory inhabited by the Shoshone, Arapahoe, Cheyenne and Pawnee tribes. Their centuries-old way of life would soon be ended by the railroad. The Plains Indians depended on hunting bison, the buffalo, that flourished in herds of thousands on the prairie. Buffalo need a tremendous amount of undisturbed land to graze on.
In the end it would take three railroad companies to build the transcontinental line. The 2 big ones, who would be laying the most track, had a race (of course) to see who could first reach Promontory Point in Utah. On May 10, 1869 the two tracks were joined together. The last spike to be driven was solid gold.
After that, you could board a train in New York City and travel clear to San Francisco—all by railroad. You still can—it takes 2 and a half days. https://www.rome2rio.com/s/New-York/California
UPDATE! My pal Diana (known to you readers as Ms Physics) pointed out this article about the return of the buffalo herds. What great news! https://returntonow.net/2020/06/19/bison-return-to-lakota-reservation-in-south-dakota-for-first-time-in-150-years/?fbclid=IwAR39CIg4w2RyhmtwfSrNDvn0bIbdkLO3clVsvw3tizMmojf8UkQWXJYSQoU
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