A New Form of Expansion Before the onset of the Spanish-American War in the late 19th century and World War I in the early 20th century, the United States had encouraged the expansion as a way of gaining power. For example, the Frontier thesis conveyed that it is through the expansion of new lands that humanity will continue to progress. The United States also described its eagerness to expand through Manifest Destiny: the desire to expand from sea to sea with the goal of owning and cultivating as much land as possible. However, with the advent of the late 19th and early 20th centuries, America experienced a change. It grew from an ambitious and power-seeking country, starting out as the richest and a superpower. America, it seemed, had become a country that helped the world, not itself, through expansion. Although the United States' path of expansion was unbroken in its plan for Manifest Destiny; Through trade, foreign policy and social class evidence, it can be confirmed that between the end of the 19th century and the beginning of the 20th century, the “new world power” was considered a source dependent on third world countries and from the reason of departure of the United States. its departure from its continued expansionist past, was to maintain order and promote the constancy of individual countries. To maintain order, the United States has abused its right to economic power. Although the United States hoped for a logical foreign policy, at the same time it seemed to abuse its economic power, trying to favor the country's "increasing production" (Doc C) and its promotions that "allow a country to extend its influence outwards" (Doc C). C).The... middle of paper......of hand, as immigrants began to enter the American workforce,Roosevelt used his "Square Deal" to declare that he would use his powers as president to safeguard workers' rights. In America and all foreign countries, US expansion efforts continued to pursue their old goal of maintaining Manifest Destiny and expanding their economic power globally. However, they have begun to form a new course of expansion leading to the support of global stability and order. Their way of thinking to achieve this goal was not achieved by believing in becoming a world superpower, but brought to the United States by the foreign masses of underdeveloped countries, who counted on them for political, economic and social stability in the late 19th and the beginning of the 20th century..