It seems you might be referring to a specific question or a list where "question number 9" pertains to a particular territory. However, without that specific context, I can provide information on notable territory purchases by the United States. Here are a few significant examples:
- Louisiana Purchase - Acquired from France in 1803.
- Florida - Purchased from Spain in 1819.
- Alaska - Purchased from Russia in 1867.
- Gadsden Purchase - Acquired from Mexico in 1854.
If you clarify which territory you are referring to, I can provide a more precise answer.