Answer:
The economies grew through expanded trade
Explanation:
Imperialism: Conflict over imperial holdings.
Militarism: The rising power and might of armies in Europe.
Nationalism: The idea that your country is superior to others.
Personally, I think it's because it was simple and free entertainment. Given that there wasn't a taboo around death and watching others die, and it actually being encouraged, like how it was in Anciient Rome, I'd say a lot of people would actually at least try out visiting a gladiatorial contest.
