That is impressive. Who did you attack first? I would imagine the Axis would be the nearest target, but they're also possibly the most difficult to come up against, except perhaps the Russians.I won on Diety with the Neutrals, starting with 2 or 3 cities.
Strategy: Sell improvements in cities to raise cash. Get Rail Road and the tech that allows artillery. Build two small cities, each with barracks. Build up veteran artillery and start taking cities, which gives you tech and cash. When you take a city, start selling improvments, and rush build more artillery. Make peace after you have taken cities. Build up forces. Then start another round of attacks.
http://apolyton.net/forums/showthread.php?s=&threadid=2712&perpage=30&pagenumber=1
Spanish win. It can be done.