The court of Appeals is tasked to determine whether or not the law is applied correctly in the trial court. The Appeals courts consist of three judges and don't use a jury. The court of Appeals don't retry cases or hear new evidence but review the procedures and decisions made by the trial court to ensure that the proceedings were fair and proper law was applied correctly.
The main reason the U.S did this is because of cheap labor cost the United states us able to control and own industries in these areas through transnational cooperations
The answer is nationalist