Which two nations became the chief trading partners of the new countries in Latin America in the 1800s?

The two nations that became the chief trading partners of the new countries in Latin America in the 1800s were Britain and the United States.

Here's a step-by-step explanation:

1. After Latin American countries gained independence in the 19th century, they needed to establish new economic relationships.

2. Britain, being the most powerful industrial nation at the time, saw an opportunity to expand its markets and invested heavily in Latin America. They exported manufactured goods and imported raw materials.

3. The United States, a rising industrial power, also sought to establish economic ties with Latin America. The Monroe Doctrine of 1823 was a clear indication of the United States' interest in the region. This policy warned European nations against interfering in the Americas, effectively asserting U.S. influence over the continent.

4. Over the course of the 19th century, both Britain and the United States became the chief trading partners of the new Latin American nations, shaping the economic landscape of the region.