What alerted the united states to the soviet belief that capitalism and communism could not coexist in the world?

a. george kennan's long telegram

b. the cuban missile crisis

c. the communist takeover of china

d. the potsdam conference

Space is not completely empty. there are small particles in space. what happens when these particles come together?

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.

Name at least three countries neaolpeon controlled