Why the railroad land grant are has a checkpoint pattern. Explain this idea in a short essay

The expectation was the railroads would quickly sell the land to settlers to raise the money to pay for the building of the railroad. However, in practice government conditions usually prevented, and railroads often chose not to sell the land. Instead, railroads usually used their land grants as collateral to obtain loans.

On each side of the tracks, but to help meet expenses, ten was changed to twenty miles on each side in 1864. Because of the checkerboard pattern twenty miles would result in ten railroad blocks on each side of the tracks, and the federal government would keep most of the non-railroad blocks of land.

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the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.