>The region acquired the name Wyoming by 1865, when Representative James Mitchell Ashley of Ohio introduced a bill to Congress to provide a "temporary government for the territory of Wyoming".
> The region's population grew steadily after the Union Pacific Railroad reached the town of Cheyenne in 1867, and the federal government established the Wyoming Territory on July 25, 1868
> Once government-sponsored expeditions to the Yellowstone country began, reports by Colter and Bridger, previously believed to be apocryphal, were found to be true. That led to the creation of Yellowstone National Park, which became the world's first national park in 1872. Nearly all of Yellowstone National Park lies within the far northwestern borders of Wyoming.
> In August 1886, the U.S. Army was given administration of the park
> Democrats and Republicans alike in Wyoming Territory agreed by the late 1880s that it was time their territory became a state. Statehood was attractive to the territory’s businessmen and politicians, as it offered them much more local control over land and water issues
https://www.wyohistory.org/encyclopedia/wyoming-statehood
> Gov. Warren called a special election for Nov. 5, 1889. The Constitution passed overwhelmingly by a vote of 6,272 in favor to 1,903 against. [ this at a time where the total population of the state was around 60,000 ]
>Cheyenne businessman and rancher Francis E. Warren, was appointed to a second stint as territorial governor in 1889, replacing Moonlight. Warren strongly supported statehood. [...] (Territorial governors and other top officials were appointed by the president.
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I don't find your view of Wyoming's history persuasive. The territories were created and managed by the US federal government, with every expectation that they would either become states or simply remain US-controlled territory. They were never independent pseudo-states, and if they remained a territory, they had even less control over their own destiny than if they became a state.