Will give brainliest if correct What is most characteristic of the Platt Amendment?

It gave America the right to intervene in Cuban affairs.
America could not protect the interests of Cuba.
It is an example of Big Stick Policy.

What triumphs did the late 19th century witness in the realms of industrial growth, urbanization, and technological innovation? what challenges did these developments pose for urban dwellers, workers, and recent immigrants? how did city officials and everyday citizens respond to these challenges?

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.

Which of these is one of the seven delinquent behaviors? a) voluntary manslaughter b) speeding in a school zone c) vandalism of public property d) destruction of private property