The building of railroads made it easier to buy and sell thinned from father distances and for cheaper since you could pay less to send or buy more things via Railroad instead of by horse.
They were forced to move because Andrew Jackson ignored the Court and forced them to move to new lands West of the Mississippi River. They had to walk all the way to their new homes, which is known as the Trail of Tears.
Hope that helps!
Question 1 2
Question 21
Question 3 4
Question 43
Question52