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Why is there such a big gap between North America and South America?

The United States and Canada are British colonies. At that time, Britain's national strength rose and naturally developed rapidly.

Brazil and Argentina are colonies of Portugal and Spain. The suzerain's national strength is weak and its development is naturally slow.

The rulers of North America, British, German and French, have no mixed blood, pure blood and excellent genes. The Spaniards in South America are seriously mixed with the local aborigines, and the quality of the population has seriously declined.