Final answer:
The part of the US government responsible for interpreting laws is the Judicial Branch, which includes the Supreme Court and other federal courts.
Step-by-step explanation:
The part of the US government that interprets laws is the Judicial Branch. This branch is made up of courts, including the Supreme Court, which is the highest court in the United States.
The Judicial Branch has the important role of determining whether laws are constitutional and align with the foundational law of the country, a process known as judicial review. While the Legislative Branch is responsible for making laws and the Executive Branch is responsible for enforcing them, it is the Judicial Branch that interprets laws to provide checks and balances within the federal government.