What happened as a result of humans settling down into agricultural villages? priests began to control religious practices

people stopped trading with each other

social roles and work definition began to change

writing was invented

What stalled germany's initial invasion into france in 1914

Why did china build the great wall of china?

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.