What is a propaganda? what group was in charge of it in america?

Propaganda is biased/misleading information, usually to promote/publicize something political.

There was no specific "group" in charge of propaganda in America, but it was definitely used in World War l and ll.

One of the most famous propaganda's, though, is Paul Revere's exaggeration of the Boston Massacre.  

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the answer is bastille

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.