The U.S. Supreme Court case Bullock v. State of Florida, 1920, revolved around the issue of whether a state could regulate intrastate railroad rates without violating the Commerce Clause of the Constitution which gives Congress exclusive power over interstate commerce. The Railroad Commission of Florida had ordered an increase in intrastate freight rates and this was challenged by Judge Bullock on behalf that it would indirectly affect interstate commerce as well. The Supreme Court ruled in favor of the State of Florida, stating that while states cannot directly regulate or interfere with interstate commerce, they can control aspects within their own boundaries even if there may be some indirect impact on interstate activities. This decision upheld states' rights to manage local affairs and set a precedent for future cases involving similar issues.

The dissenting opinion in the case of Bullock v. State of Florida, 1920, argued that the majority's decision to uphold a state law requiring railroads to maintain separate but equal accommodations for black and white passengers was inconsistent with previous Supreme Court rulings on similar issues. The dissenters contended that such laws were inherently discriminatory and violated the Equal Protection Clause of the Fourteenth Amendment. They believed that any law mandating racial segregation created an unjust hierarchy between races, regardless of whether or not facilities were ostensibly "equal." Furthermore, they pointed out practical difficulties in maintaining truly equal segregated facilities due to varying passenger numbers among different races at different times. Thus, they concluded that it would be impossible for states to enforce these laws without violating constitutional principles.