<span>Although the Monroe Doctrine of 1823 was essentially passive (it asked that Europeans not increase their influence or recolonize any part of the Western Hemisphere), by the 20th century a more confident United States was willing to take on the role of regional policeman. In the early 1900s Roosevelt grew concerned that a crisis between Venezuela and its creditors could spark an invasion of that nation by European powers. The Roosevelt Corollary of December 1904 stated that the United States would intervene as a last resort to ensure that other nations in the Western Hemisphere fulfilled their obligations to international creditors, and did not violate the rights of the United States or invite “foreign aggression to the detriment of the entire body of American nations.” As the corollary worked out in practice, the United States increasingly used military force to restore internal stability to nations in the region. Roosevelt declared that the United States might “exercise international police power in ‘flagrant cases of such wrongdoing or impotence.’” Over the long term the corollary had little to do with relations between the Western Hemisphere and Europe, but it did serve as justification for U.S. intervention in Cuba, Nicaragua, Haiti, and the Dominican Republic.
<span>the Monroe Doctrine of 1823 was essentially passive (it asked that Europeans not increase their influence or recolonize any part of the Western Hemisphere), by the 20th century a more confident United States was willing to take on the role of regional policeman. In the early 1900s Roosevelt grew concerned that a crisis between Venezuela and its creditors could spark an invasion of that nation by European powers. The Roosevelt Corollary of December 1904 stated that the United States would intervene as a last resort to ensure that other nations in the Western Hemisphere fulfilled their obligations to international creditors, and did not violate the rights of the United States or invite “foreign aggression to the detriment of the entire body of American nations.” As the corollary worked out in practice, the United States increasingly used military force to restore internal stability to nations in the region. Roosevelt declared that the United States might “exercise international police power in ‘flagrant cases of such wrongdoing or impotence.’” Over the long term the corollary had little to do with relations between the Western Hemisphere and Europe, but it did serve as justification for U.S. intervention in Cuba, Nicaragua, Haiti, and the Dominican Republic.</span>
The Neolithic Revolution <span>was the wide-scale transition of many cultures from hunting and gathering to agriculture and settlement, making larger populations possible.</span>
The immigration policies of the united states were influenced by the public opinion who saw immigrants as a threat to job employment, polluting the cultural identity of the United States. Before the 1960's preference was given to the European immigrants as they were seemed to more civilized however trend changed since the 1960's where Asian and Latin American immigrants have increased considerably. Skilled labor from the Asian countries is in demand In the Unites States. Mexico joining border with the United States provide a secure path to immigrants' entry into the United States.
