Which concept allows states to make laws differently from each other?

The concept that allows states to make laws differently from each other is rooted in the idea of states' rights. This principle emphasizes the autonomy and powers of individual states, allowing them the authority to establish their own laws and policies without interference from the federal government, as long as these laws do not violate federal law or the Constitution.

States' rights are grounded in the federal structure of the United States, which recognizes both state and federal governmental powers. This allows states to govern areas such as education, transportation, health care, and law enforcement according to their own priorities and values, leading to a diversity of laws and regulations across the country.

In contrast, full faith and credit refers to the constitutional requirement that states recognize and honor the public acts, records, and judicial proceedings of other states, which does not directly relate to the power to make different laws. Interstate commerce involves regulation of trade and economic activity across state lines, which is more about federal oversight than state autonomy. The matter of jurisdiction relates to the authority of a court to hear a case, not the ability of states to enact varying laws. Thus, states' rights is the correct choice as it explicitly refers to the power of states to legislate independently.