The homestead act help the western migration by providing 160 acres of land.in exchange, the homesteaders paid a small fee and were required to 5 years of residence before having ownership of it. I hope this will help you.
They produced different materials and crops.
Mark Twain called the late 19th Century the "Gilded age" . So Mark Twain meant that the period was glittering on the surface but corrupt underneath.
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An example of a good Europeans introduced to the Americas is live stock, such as horses, cattle, chickens, pigs, sheep, ect.
It would be A (this is just to get past the 20 mark)