Answer:
to inform
Step-by-step explanation:
Based on the details in this excerpt, the purpose of the speech is to inform.
This is because the speech was made at the opening ceremony of the New York Brooklyn Bridge by the Mayor of the city, Hon. Seth Low. The speech was aimed at informing the people of the city that the bridge is ready to be used. He makes many informative statements like, "This Bridge is a landway over the water, connecting two cities" and "The Brooklyn of 1900 can hardly be guessed at from the city of to-day.".
An informative speech aims at letting the audience know the details about something.