Jack Wallace scored three goals for the United States to lead them to a fifth straight Paralympic sled hockey gold medal and sixth overall.

Team USA finished second in the overall Paralympics medal count, after 10 days of competition in which American athletes made dazzling debuts, defended titles and cemented legacies.

In front of a packed arena, Jack Wallace scored a hat trick to help the U.S. beat Canada 6-2 in Sunday’s Para ice hockey final and become the first nation to win all three of the hockey tournaments at...