I want the - to be replaced by the answer. I know you are only supposed to ask one question, so that's the main one, but if it's possible, can you also answer these?

2 farmers did not like pools and rebates because -
3 railroads opened up the country to -
4 railroads helped industry grow by creating a need for -
5 the railroad companies employed thousands of -
6. new businesses and towns spray up near -