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

The highest court in both Canada and the United States is called the Supreme Court. This court plays a critical role in interpreting the law and ensuring that the legal system functions according to the constitution. In Canada, the Supreme Court is the final court of appeal and serves to resolve significant legal disputes, including constitutional issues and cases of national importance. In the United States, the Supreme Court also holds the position of the final arbiter of federal and constitutional law, making pivotal decisions that can have wide-ranging implications on American society and governance.

The other choices represent different levels or types of courts within the judicial systems of their respective countries. For example, District Courts are lower-level trial courts in the U.S., while the Court of Appeals and High Courts are also appellate courts but do not hold the same final authority as the Supreme Court. Each of these plays an important role in the judicial system, but they do not have the same level of supremacy that the Supreme Court holds.