The belief that American settlers should start spreading westward and settling those lands.
Answer: it is a name of independent trade unions in Poland established in 1980 in Poland. But it true role was a social movement that started opposing to Communist party (the only party, state-party) in Poland.
Explanation: It contributed significantly to the fall of Communism in Poland (1990). It was not the only anti-Communist movement in Poland at that time, but it was the most important.
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The Impact of the Erie Canal - Rochester
The Erie Canal was built from the Hudson River to Lake Erie. It improved the economy in some cities in New York such as Buffalo Lockport, and Rochester. It lead New York to industrialization. It decreased the cost of transporting goods.