This is a really amazing piece that I'm glad to be able to share with you. This is a 1901 Pan-American Exposition postcard with a view of the machinery and transportation buildings. This card was used in Buffalo, NY the day After Teddy Roosevelt’s Inauguration.
The writing on the face says:
Seen Lincoln in 1865What an amazing piece of history!
Seen McKinley in 1901
Both after Assassination
John R. Bricks