How did republicans impact reconstruction

What issue lead from texas seceding from the union

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.

Space is not completely empty. there are small particles in space. what happens when these particles come together?