Why was the fort laramie treaty, signed in 1851, significant to westward expansion?

Draw conclusions  why might a cause like italian unification successfully draw people of very different backgrounds together?  

During andrew johnson’s presidency, the radical republicans gained control over policymaking in congress. they had enough power to override any presidential veto. how did the radical republicans use this opportunity? a. they blocked johnson’s weak reconstruction policies by taking charge of the reconstruction plan. b. they extended their support to johnson’s policies for reconstruction of the south. c. they removed johnson from office and took over the task of reconstructing the south. d. they removed all former confederates from office and stopped the south from rejoining the union.

What are some american advantages that led to victory in the revolutionary war?