Over 442 million people in at least 20 nations recognize Spanish as their official language. Knowing how to speak Spanish and visiting any of those countries will ensure better communication with the natives which would lead to one enjoying their trip more.
Knowing Spanish for such trips is to therefore be considered an advantage.
Whittier uses the symbolism and imagery of war in his poem "To William Lloyd Garrison" to inform the audience because they had little or no experience with this "peculiar institution." He uses the sword to symbolize the fight that him and Garrison were involved in by speaking out against slavery in this time.