What is the highest court in Canada and the United States called?

The highest court in both Canada and the United States is indeed called the Supreme Court. This court serves as the ultimate judicial authority in each country, with the power to interpret constitutional law, make significant legal rulings, and serve as the final arbiter of disputes.

In Canada, the Supreme Court is vital for adjudicating on major issues, including constitutional questions and fundamental rights, thus maintaining the rule of law and upholding the Charter of Rights and Freedoms. Similarly, in the United States, the Supreme Court interprets the Constitution and has the authority to strike down laws or executive actions that are deemed unconstitutional.

The other options refer to different levels or types of courts. For instance, District Courts and Circuit Courts are lower-level courts found within the judicial systems of both countries, handling various cases but lacking the authority of a Supreme Court. Appeals Courts specifically deal with cases that have been challenged from lower courts, but again, they are not the highest court in the land. Therefore, Supreme Court is the correct designation for the highest court in both Canada and the United States.