Do you think first nation supported the railway? why or why not

It is likely that some First Nations supported the railway, while others did not. Some First Nations probably supported the railway because it gave them a chance to trade more extensively. Moreover, it was a convenient and efficient method of transportation. However, others might not have liked the idea. They might have mourned the loss of their land and the expansion of settlers, as well as the damage to the natural environment (in particular to the migratory patterns of bison).

it was certainly a debatable decision, mainly because it was based primarily on political - and not on legal or social - views. since the congress at that time was led by members of the republican party, and the territory that the tribes wanted to turn into an exclusively indian state was predominantly democratic, the proposal (as expressed in the constitution) did not succeed, but the constitution itself proved to be of crucial importance in the creation of the state of oklahoma, and, most importantly, it guaranteed the involvement of representatives of the indian tribes in the government of the future joint state.  

as a member of congress, i would have voted to ratify the constitution, or at least to have it tabled. ignoring it was an interested and partial decision.