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Explanation of how it supports thesis in 1-2 sentences (specifics!)

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After 1800, political, economic, and social changes greatly contributed to a new era of  expansion under the philosophy of Manifest Destiny for the United States by a desire for territorial control which resulted in a disregard for political consequences, an increased need for natural resources, and increased white prosedstant supremacy.

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To a significant extent, political, social, and economic changes contributed to a new era of expansion because of new statehood, sectional competition and westward migration.

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Gadsden purchase: treaty used to get Mexico, enabled transcontinental railroad

California annexation: territorial control shift after Mexican War

Oregon  territory: More political conflicts with other nations (Britain to Pig War)
Polk willing to go to war with Britain for manifest destiny

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Alaska Purchase:  was a Political territorial change between the Russians and the Americans, but also an economic change because Alaska had many resources, that included precious metals like gold that they desired.
Gadsden Purchase:  It was also an economic change because it enabled the transcontinental railroad to be established due to the accessibility to more land and the gulf.

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The California Annexation: the annexation of North Mexican lands after the Mexican-American war leading to political debate between the south and the north as to which states would become free and which would legalize slavery

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Mormon trail: the Latter-day-Saints’ haven became a U.S. territory after the American victory in the Mexican War and after a while it became evident that the freedom they found in their new home was not to last. They wanted to escape persecution in the states

Indian removal Act:
The people that believed in the manifest destiny thought that the Indians living in the west were preventing them from moving westward

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Political, social, and economic changes significantly contributed to a new era of westward expansion as seen in territorial establishment, religious movements, and federal mandates.

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Religion: the Latter Day Saints' migration caused an increased spread of their religion.
Slavery: it was defining element of American society as it defined which states would be considered South or North.

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As people moved westward, many in the south sought to expand slavery and increase cotton production as a result. This would better the economy and increase the wealth of the South. In addition, transportation by railroad would be established and further the movement of goods and people to increase welfare.

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The Gadsden Purchase: It was an economic change because it caused a fight between Northern and Southern railroad companies as it would give an advantage to the Southern Companies.

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Political economic and social change contributed significantly contributed to a new era of expansion because Legal acts passed by congress, Spread of religion, and increased economic opportunity.

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The indian removal act was a legal act passed by congress, in an attempt to make westward migration easy.

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The Gadsden purchase was an economic change because it caused the transcontinental railroad to be established. This made land and expansion more accessible.

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The idea of manifest destiny was what pushed America to go to war with Britain again, which allowed them to gain more land and reduce British influence. This is also what drove US citizens to brave the wilderness and colonize the western half of North America. New religious ideas spread by the Mormons also encouraged people to go out and work for their own salvation.

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Despite other nations owning land in North America, political, economic, and social changes contributed heavily to a new era of expansion under the banner of Manifest Destiny after 1800, due to the creation of new laws, annexation of new land, and brewing conflicts.

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The Indian Removal Act forcibly removed natives from their lands, to make it easier for white settlers to travel westward & obtain land. This Act was heavily influenced by the idea of Manifest Destiny since at the time many people believed that Natives were stopping them from traveling westward. This Act was created to remedy that issue for white settlers.

The Preemption Acts made it so individuals were allowed to acquire federal land and claim it as one's property. “Squatters” were able to purchase this land at a low price before it was put up for sale to the public. This was made in response to the westward expansion by manifest destiny.

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The Annexation of Texas led to Mexican Immigrants becoming part of the Union, and amount of racial segregation and discrimination ocurring during this time led to conflicts arising in the new states

The California Annexation led to Utah and New Mexico being a part of the Union, and they could join the Union as either a free or slave state-- they were able to vote on whether they would be a slave or free state. Texas had new borders established as well.

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After the Gadsden purchase, separation between Northern and Southern states was emphasized. Northern abolitionist senators opposed the purchase, believing it to be future slave land. This supports our argument, as the acquisition of lands like the Gadsden Purchase only furthered previous conflicts like the debate over slavery.

The Mexican-American War: When Polk was elected he encouraged the annexation of Mexico. When he offered to purchase them but Mexico refused he sent troops to a disputed zone between the Rio Grande & Nueces river.

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Although American politics partially stayed the same, political, economic, and social changes contributed to a new era of expansion because of new states being added to the Union, the establishment of new laws, and internal conflicts.

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The Indian Removal Act demonstrated political change that occurred because it made westward expansion easier for white settlers to force Native Americans out of their territory.

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Political, economic, and social changes significantly contributed to a new era of expansion in the form of manifest destiny with various treaties, new economic opportunities, and mass migration/expansion westward.

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The Gadsden purchase was an economic change because southern companies gained economic profits through transfering goods in railroad companies.

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This was one of the first instances where we used political power to force a group out. By forcing the Indians out of their territory we jumpstarted the expansion westwards because after gaining this new resource-rich territory Americans were hungry for more exploration and riches, leading to more expansion

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The territories gained from the Mexican-American war were very rich in resources, specifically gold. Americans would flock to these new territories in hope of getting rich. This led to expansion because the Americans would develop these areas and expand their influence across these undeveloped parts of the country during the whole process of trying to get rich (desire for riches.)

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This migration west of the Mormon social/religious group marked one of the first major migrations west where people moved in order to avoid discrimination and to live the way they want. This would later influence other migrations and become an overall example of how moving West could act as a “getaway” making it seem socially desirable from some to move and expand west

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The Mexican-American War, which was authorized by Polk, created issues such as conflict in present-day Mexico for territories. There were also internal conflicts about whether states should join as free or slave states.