Oppenheimer was the wartime head of the Los Alamos Laboratory and is among those who are credited with being the "father of the atomic bomb" for their role in the Manhattan Project, the World War II undertaking that developed the first nuclear weapons used in the atomic bombings of Hiroshima and Nagasaki.
According to the statement above: "In "Trail Mail!" which BEST describes the author's main point of viewabout the Pony Express?"
The answer is that the first rapid transit and fast mail line across the continent from Missouri River to the Pacific Coast.
Hope this helps.
about 9,000 is the answer