Were an issue that widened the gap between North and South. tariffs child labor laws​

In a group discussion, which of these is the best example of synthesis claims into a single conclusion?

This is the belief that a nation must develop and maintain a strong military force in order to pursue and defend its national interests.

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.