The congress has the power to declare war, it is spelled out, and is this type of a power.
a.
concurrent
c.
expressed
b.
implied
d.
inherent

Expressed is when it is written down. some laws weren't so that there was room for leniency ( hence: implied). the answer is expressed

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.