The Delmar Jockey Club v. Missouri case in 1907 revolved around the constitutionality of a state law that prohibited betting on horse races, which was challenged by the Delmar Jockey Club. The club argued that this law violated their property rights as it interfered with their business operations and profits. However, the U.S Supreme Court upheld the validity of Missouri's anti-gambling laws stating they did not infringe upon any constitutional rights. The court emphasized that states have broad powers to regulate businesses within their borders for public welfare purposes, including prohibiting certain types of gambling activities if deemed harmful or immoral by local standards. This ruling affirmed states' authority to control and limit gambling activities within its jurisdiction.

The dissenting opinion in the Delmar Jockey Club v. Missouri case argued that the state of Missouri did not have a right to interfere with interstate commerce by prohibiting betting on horse races taking place outside its borders. The dissenters believed that such an act was unconstitutional as it violated the Commerce Clause of the U.S Constitution, which grants Congress exclusive power over interstate commerce. They contended that if each state were allowed to regulate activities occurring beyond their boundaries, it would result in chaos and confusion detrimental to national unity and economic stability. Furthermore, they asserted that while states could regulate morality within their borders, extending this authority across state lines was unjustifiable and infringed upon individual liberties protected under constitutional law.