What does 'Today the American knight holds the commercial supremacy of the world' mean?

The phrase "Today the American knight holds the commercial supremacy of the world" suggests that American businesses and entrepreneurs are leading in global commerce and trade. It likens these business leaders to knights, symbolizing valor and prowess, highlighting their significant influence and dominance in the international market. This reflects the idea that the United States has emerged as a powerful economic force, shaping global economic trends and practices.