Based on the information provided about the countries from 1920 to 1937, I believe that the United States demonstrated the most successful economic performance during this period.
Firstly, the U.S. experienced significant industrial growth throughout the 1920s, aided by technological advancements and increased consumer spending. This boom contributed to a rise in employment and overall economic prosperity, often referred to as the "Roaring Twenties."
Secondly, despite the Great Depression's onset in 1929, the U.S. government implemented the New Deal, which included a series of programs aimed at economic recovery and social reform. This initiative helped to stabilize the economy and provided essential support for many citizens, laying groundwork for future growth.
Lastly, by 1937, the U.S. economy was showing signs of recovery with decreasing unemployment rates and increasing industrial production, contrasting sharply with the stagnation or decline experienced in many other countries. These factors combined affirm the United States' strong economic performance during this era.