Answer:
Information is available at Brittanica.com or smithsonian.com
Explanation:
For louis and clark try a formal tone.
For sacawagea try a casual tone
For York give him a gentelman
Answer: hmm i think they said the "the pen there strongest weapon and book" because knowledge is there strongest weapon? sorry if i'm wrong i don't know .-.
Explanation:
The answer is: Runners allowed villages and cities throughout the empire to communicate quick with rulers far away.
Hope this helps!:)