What triggered the beginning of the korean war?

a communist north korea invaded south korea.
b the soviet union declared north korea a satellite state.
c the soviet union established a strong military presence in korea.
d china came to the support of north korea.

Match the vocabulary word with its meaning. 1. gender a large-scale spread of a deadly disease 2. pandemic the development and use of machines, devices and ideas to further people's knowledge 3. technology the sex of a person, whether male or female

The development of greek culture was most influenced by the dorian invasion the region’s climate and geography the trojan war indo-european migrations

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.