Answer: You could write to them about how it's like in the new world, how people get treated, how people dress, how it's differen't from where you "grew up", etc.
Explanation:
It was used to communicate using written language
I’m thinking it was the boxer rebellion as that happened not long after the open door policy
Was born in Pennsylvania, he directed an expedition that discovered a path westward through the Cumberland gap. He then settled in an area he called Boonesborough in Kentucky, then moved to Point Pleasant, what is now West Virginia. He died in Femme Osage Creek, Missouri.