What industry did politicians use to spread information about their own party and opponents?

Politicians use Newspapers to spread information about their own party and opponents.

Explanation:

Newspapers are a very important tool of political manipulation. Through this tool, political parties can disclose their strengths, qualities and any kind of relevant information to increase their influence.  Similarly, through newspapers, political parties can expose their opponents, showing scandals, negatives points, political errors, abuse of power, among other events that show that the population should not rely on politicians associated with that party.

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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