This recently became available, all ten episodes, on a set of four DVDs. I found the set at my public library. There is a scene in the first episode, as a large group of people and wagons are gathering, for their trek to the North and West. They are gathering on the Trinity River outside Fort Worth, Texas, and one person is offering condolences for the husband's death. She responds, "You can't believe in Heaven then be sad when people go there." I had never heard it put that way before.
As the end credits on each episode states, the stories were "inspired" by events of the 1880s as people from Eastern areas began to move out west. Many wanted to go to specific places, like Oregon or Washington. But some just wanted to go someplace new and figured they'd know it when they see it. As was the Dutton family from the woods of Tennessee. The stories portrayed had input from historians and are largely authentic to the time and the travels to settle the West.
I didn't see "Yellowstone" season four but the DVD extras talk about flashbacks that were the inspiration for "1883", intended to be the origin story of how the Dutton clan ended up settling where they did in Montana.
The 1880s as portrayed here are rough and dangerous. Steal a wallet and you might be hanged and shot. If you are found with small pox you are banished and you might as well find a nice river bank and lie down and wait to die. Traveling was dangerous, bands of thieves or aggressive Native tribes might steal your horses, kill you and scalp you and your family. Yet they persisted. Many perished along the way, some made it.
It is overall a big investment in time to watch all ten episodes but I did it over a week and found it to be a totally captivating and worthwhile show. A few extras on the 4-disc DVD set show a number of interesting "making of" features.