some changes in Civ 5
-There's unhappiness, existed since vanilla, maintenance mechanic for cities and expansion.
-happines availability overall was nerfed quite a bit compared to vanilla, with changes to buildings.
-There's gold maintenance for units and buildings, existed since vanilla maintenance mechanic for war and infrastructure.
-Then they nerfed trade posts and riverline gold. maybe this came in G&K if I remember correctly.
-At some point they brought in local happiness instead of global happiness..
-Bnw introduced science penalty for number of cities, which is like a second maintenance mechanic for expansion, essentialy. The idea, that a larger empire becomes actually weaker, is a new fundamental in civilization genre. Certainly back in the older civ4, large empire was more or less beneficial overall.
-At some point cities became a lot stronger defensively. I forget which version this came from. This development seems to have brought the ranged spam tactic really into the civ 5 strategy for war, as far as I recall. Melee was heavily nerfed as result.
-All of the game mechanic changes described above, entirely obsoleted many social policies, which is bad for the game overall. Piety and Honor were basically obsoleted entirely in BNW. They are unplayable social policies, unless you play Germany on marathon large settign, with raging barbs.
-Honor becomes worse once again, because early war is impossible to be maintained because lack of gold. And the entire honor tree is based on the idea of early warmongering. Piety was never that strong to begin with, as I recall, and there are literaly zero happines policies in the tree. Also there aren't many culture policies in piety.
-World congress mechanic is somewhat boring addition in my opinion. I always hated it ever since it was brought into this game. Sometimes, I just like to play with zero city states simply because it restrains the AI shenanigans. (ban luxury, pass army tax, pass arts funding etc...)
Lol I wonder what the US ambassador would respond, if the UN proposed in real life to tax America, based on America's military spending levels domestically. A threat to peace, you say...? What makes you think such a tax would be able to be levied practically?