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The united state bought Louisiana on April 30,1803 for $15 million.According to the article i used for this the U.S originally was going to buy port of New Orleans and Florida for $10 million but then France offer Louisiana which was much bigger and the U.S bought it for $15 million.

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This act helped the U.S government displace Indians from their tribe lands.Andrew Jackson the president during 1829-1837 built a approach to get Indians removed from the land.Therefore jack encourage the congress to accept the Indian removal act.

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On April 11,1844 Texas signed a treaty for annexation with united states.This meant that Texas would enter the United States as territory and not a state.This also contributed to the Mexican-American war.

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Hawaii islands were formally annexed in 1989 because the american business men overthrew the last monarch of Hawaii.After the last monarch was overthrown the president a treaty to annex Hawaii.

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Polk tried to buy California and New mexico from Mexico for $30 million but mexico refused which made polk frustrated and ended up pushing and used that as an excuse to start war with mexico. After the U.S won mexico was in debt with the U.S therefore gave up New mexico and California.

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The united states was bought off Russia in 1867 .This is because Russia had offered to sell its north american territory to the united states.Russia at this time was also struggling with debt at this time.