What does the fact that private companies own most media in the u. s. indicate to you?

That fact indicates that every government decisions that made is most likely would benefit these companies.
In United States, 6 companies controlled 90% of the Media. 
This will give them a lot of power to control informations that could influenced the outcome of the election. So they can pretty much appoint whichever candidates that suited their agenda.

The nineteenth amendment changed voting rights as it allowed for women to vote nation wide