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In what way do you think it would be difficult to live next to the united states

What point is the author trying to make by comparing the travel times of the first transcontinental railroad and the first transcontinental flight?

Lauses unnecessary to the meanings of the words modified demonstrative 2. clauses necessary to the meanings of the words modified relative 3. words for which pronouns stand intensive 4. a pronoun ending in -self and referring to the previously used noun or pronoun nonrestrictive clauses 5. a pronoun ending in -self and used for emphasis restrictive clauses 6. pronouns that ask questions indefinite pronouns 7. pronouns that point out to whom or to what the speaker is referring reflexive 8. everyone, nobody, and something are examples antecedents 9. pronouns introducing adjective or noun clauses interrogative 10. i, you, him, mine, and their are examples personal pronouns