Immigration in the Equality State Long before Heart Mountain Internment Camp brought Japanese prisoners to Wyoming, an immigrant work force put down lasting roots. Beginning in 1892, Japanese came to toil on Union Pacific's railroad and coal mines. But they weren't warmly welcomed. Newspapers charged every Japanese section worker was secret Japanese Army. Allegedly, "600 Japs in Utah, [and] about 400 in Wyoming and probably 100 in Colorado," were ready to serve Japan during the Japanese Ru...