Land grants made it possible to build a country wide system of rail fast.
Step-by-step explanation:
At the time when the country wide railroad system in the US was established there had not been something that was so expansive and so ambitious that was ever done.
It was an architectural and logistical feat to achieve and the Americans had done it with swift disposition.
This was possible in part, due to generous land grant by the government to the people building it and there was never a halt in the construction that was not resolved fast.
This remittance of land made it one of the fastest constructions of its time.