Civilization Supermeta

supermeta by Seth Kleinerman
Mario world structure by Andrew Thomas, David Poland, and Aaron Dinkin

The six Wonders can be sorted in order from most recent to least recent; or the metas can be sorted in order by number of puzzles contributing to them from greatest to least. These are the same order.

The metapuzzle answers are:

Each of these is a two-word phrase in which one of the words is (also) a French word. Translate the French words into English:

Now you have six pairs of English words of equal length. In fact, in each pair, the two words have exactly one letter in common in the same position. Extracting these letters spells ORANGE, the solution to the supermeta.