He was a general and something I don't know
Pick something that really interests you.
By acting in the Boxer Rebellion, the United States proved they would use force to promote their own business interests.
Protect it's own interests
to protect their oil interests. (apex)
I would say it depends on your friend. If you really are best friends with a person, you'll know their interests. When you know their interests, fav colors, etc., then just find something that has something to do with their interests.
You have not said what interests you, what subjects you like or you are good at. Personally I would say choose something that suits your interests and so would find studying easier.
It would help us to answer this question if you were to tell us something about the situation that interests you.
Common interests such as sports, video games, news, school or the future
Something that interests you.
They found something important or something that interests them
That would depend a lot on his interests. Some men like flowers, however most would rather something more specific. Think of his biggest interests, and maybe you can get something themed with that (If he likes video games, maybe a new game, or a new controller or accessory).
If you don't already know what his interests and hobbies are, find out. Then, pick out something special that you think he would really like according to what his interests are.
Hmmm, you can't exactly give him chocolate or flowers, so I would recommend something quirky and weird, which would probably appeal to him, if he isn't into that kind of thing, try something that would appeal to his interests.
Something which interests you
You should be something or someone that interests you.
There are lots of interesting and current topics, but you should choose one that interests you. I could tell you what interests me, but there is no reason why you and I would necessarily be interested in the same things.