126. We've already established that Great People live forever. Once a Great Person settles in a city, he can never do things like build a shrine, an academy, or discover a technology (lightbulb), ever again.
127. Caravels can only transport single persons like Great People or missionaries. It is understandable that they cannot transport entire armies while still able to transport these units. Galleons, on the other hand, not only can they transport entire armies, they have space for 3 regiments. If you can imagine a regiment of troops to be somewhere around 1000 soldiers, then galleons are thousands of times bigger than Caravels.
128. Immigration does not exist.
129. It is possible to randomly find copper in a mine after 5000 years of mining and knowledge of the metal.
130. All good civilizations created workers before any military units or buildings.
131. 2049AD and desalinization plants still haven't been invented.
132. Common people and their cultures define their nations' borders, not politicians.