Final answer:
It is true that many actions can be considered immoral but are not illegal, such as cheating on a spouse. Law and morality are related but not equivalent, as laws can reflect societal norms which themselves may change over time. Examples include the repeal of Prohibition in the United States.
Step-by-step explanation:
The relation of law to morality is complex because while laws are established rules that govern society, they do not always align with what people may individually consider moral or immoral. It is true that there are many things that are immoral but are not illegal. For example, cheating on your spouse or breaking a promise to a friend are considered immoral by many, yet they are not illegal acts. Conversely, there may be things that are illegal which some groups of people may consider to be moral, depending on the context and cultural norms such as drinking under age and smoking marijuana in certain jurisdictions.
Morality is often subjective and can vary widely between cultures and individuals. It is shaped by personal, religious, and cultural beliefs, and these can change over time. Law and morality intersect when a significant number of people in a society work to legislate their moral views, but this does not mean that all laws reflect universal moral standards, nor does the absence of a law imply that an action is morally acceptable. An example of this is the 18th Amendment (Prohibition), which was repealed by the 21st Amendment after the majority view on the morality of alcohol consumption shifted.