Final answer:
By 1900, Great Britain was the nation that controlled the majority of the world's trade and finances and had the biggest empire.
Step-by-step explanation:
By 1900, the nation that controlled the majority of the world's trade and finances and had the biggest empire was Great Britain. At the height of its power, the British Empire covered approximately a quarter of the world's land surface and controlled vast amounts of resources, colonies, and trade routes. Britain's industrial revolution, naval supremacy, and global trading networks contributed to its dominance in international trade and finances during this time period.
Learn more about Great Britain's dominance in world trade and empire