How was imperialism used as a foreign policy?

Latin America has been a region exploited by national as well as foreign capital for decades. During the nineteenth century countries such as Germany, Portugal, Spain and England were the ones in charge of exploiting the natural resources of the region for decades, colonizing countries and abusing the Latin American working class. The United States arrived in another phase of history, after the aforementioned countries, but today it has already become the world power that keeps Latin America under the yoke of US imperialism.

In order for the United States to make its way into the other imperialist countries, it was necessary to establish a policy that was defended by the successive American governments, which was known as the Monroe Doctrine, which in Trotsky's words is understood as:

Explanation:

"The right of US imperialism to position itself dominant in Latin American countries, assuming the position of being its exclusive operator."