Answer: After Latin American nations won independence, US president James Monroe issued a warning to European countries. He told European countries that they May not attempt to take back the colonies that they had once owned.
Monroe Doctrine--This doctrine was announced in 1823 as a statement to Europe that they were no longer welcome in the Western Hemisphere as colonial holders.
Following the American Revolution and those of Mexico, Haiti, and South America, European countries had been almost completely pushed out of the Western Hemisphere. James Monroe announced his doctrine in 1823, stating the US would assist any country who had their independence threatened. This was to ensure the freedom of these new countries.
President Theodore Roosevelt’s<span> assertive approach to Latin America and the Caribbean has often been characterized as the “Big Stick,” and his policy came to be known as the Roosevelt Corollary to the </span>Monroe Doctrine<span>.</span>
The transatlantic slave trade was really a triangle. Here's a map to show the approximate routes. The trade was brought about to benefit the economy of Caribbean nations and Europe. The slaves were forced into awful conditions; cramped boats and harsh climates with which to toil away picking cotton or whatnot.