1. In world war II, the Americans dropped two atomic bombs on Japan.
- I think "the" is redundant here, right? and we should use "down" instead of "on", right?-- Wrong, the reference is not to Americans in general, but to 'the American air force / military / etc'. On is the correct preposition.
2. Does "dream on" mean "keep dreaming"? -- Yes, in the sense of 'ke