How did the completion of the transcontinental railroad affect companies that made products?

Companies could ship goods cheaply.

Explanation:

On May 10, 1869, construction of the Transcontinental Railroad was completed (although the connection between the coasts was actually completed the following year). This established a transport network that would become central to the US economy, as this revolutionized transportation to the companies that manufactured products because these companies could transport their products at a lower price and with greater speed.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".