What results from the federal system of government in the united states

How did many delegates from northern states at the constitutionalconvention view slavery?

Interest groups are protected by the first amendment guarantees of petition. and what other freedom?

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.