In the United States v. Forrester case of 1908, the Supreme Court ruled on a dispute over land ownership in California. The federal government had granted a large tract of land to Southern Pacific Railroad Company for constructing railway lines under an act passed by Congress in 1866. However, due to some errors and omissions in official surveys and maps, certain parcels were mistakenly left out from this grant but later claimed by the company nonetheless. Meanwhile, these lands were sold or given away by the state authorities to other parties including Mr. Forrester who subsequently sued when his claim was challenged based on earlier Congressional grant. The court held that while there indeed had been mistakes made during original surveying process leading to confusion about rightful ownerships; however since those lands were not included within limits defined at time of granting them originally - they could not be considered as part of railroad's property retrospectively now after several decades have passed with others having acquired valid titles over them meanwhile through state grants or purchases etc., thus affirming lower courts' rulings favoring defendants like Mr.Forrester against U.S Government's appeal seeking reversal.

In the United States v. Forrester case of 1908, there was no recorded dissenting opinion. The Supreme Court ruled unanimously in favor of the government's right to regulate interstate commerce, including goods that had completed their journey and were being held for future sale. This decision expanded federal power over commercial activities within states under the Commerce Clause of the U.S Constitution.