The key to the interpretation of hieroglyphics was the
a. behistun rock.
b. olduvai gorge.
c. rosetta stone.
d. book of the dead.

 The thing that helped us understand hieroglyphics was the Rosetta Stone. The Rosetta Stone is a black slab with the same piece of writing carved in three different languages.

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.