Prairie Pioneers finds the 3 Mesquiteers leading a wagon train to California. There's tension between the Americans and the Mexicans who were there before. But in some cases greed as united certain members of both groups.But it's the Mesquiteers who are divided in this film. Bob Steele's old friend Robert Kellard is the son of the local Ponderosa owner Don Guy D'Ennery. He gets framed for murder forcing D'Ennery to sell. Robert Livingston is heart and soul with the newly arriving Americans.But the bad guys are another Don, Davison Clark and the owner of a local mining company that uses hydraulics Kenneth MacDonald. MacDonald and his methods would leave his land a slag heap, but that's hardly his concern.It was nice to see the Mesquiteers who were pretty close to breaking up get it together for the final showdown.