Based on the map, what is one possible explanation of why the portion of railway built by
the Union Pacific was longer than the portion built by the Central Pacific?
It was harder for the Union Pacific to obtain valuable resources from the Midwest.
The Union Pacific's portion crossed more flat land than the Central Pacific's
portion did.
It is always easier to build from east to west than from west to east.
, The Central Pacific's starting point was farther south than the Union Pacific's starting
point.