A citizen is unhappy about a new tax on gasoline because she drives a long distance to work. She writes a letter to a news source to criticize the new law. Why is she comfortable writing this letter?

Why are primary sources important when studying historical events

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.

How did the industrial revolution give an advantage to industrialized european nations over non-industriallized nations?