Expansionists were very patriotic American citizens that wanted to spread and expand in all directions because they believed in manifest destiny.
Communications in the late 1800s were restricted. The earliest postal systems were often run by a local citizen out of his house. Postal carriers traveled by horse and only carried documents.
Because his fame protects him from retribution
If Hitler hadn’t come into power this wouldn’t have happened because he was the person who spread harsh views about certain groups of people.
I hope this helps.