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It means the state of being plural, if that helps
Answer: There was lots of land, good soil for farming, and it could be bought at a cheap price. In addition, it was very crowded living on the East Coast. The population of the United States was growing at a very fast rate. On top of getting away from the overcrowded East, there was also the possibility of finding gold.
The answer is Wyoming an it started in 1869
The use of new basic materials.