USA, 1923.
I started off slowly, just getting the Manifest Destiny and being mostly peaceful, adding the Americas to my SoI. The Dutch declared war on Brazil, though, and got help from France, so I jumped to the aid of my ally Brazil and before I knew it, both the Netherlands and Brazil had signed peace and I was just fighting France (Greenland being the main theatre of war). I demanded French Guyana, to get a naval base in South America.
Next up, a war with the United Kingdom. They didn't have gas, machine guns or bolt-action rifles, so it was a massacre and I got Washington and Bermuda.
My factories were producing more than could be sold domestically (apparently), so I went on a massive colonisation spree, that got me most of Africa (the French and Spanish parts barely have inhabitants) and pretty much all the Pacific isles, including the ones north of Japan.
Finally, France tried to annex Egypt in 1917 and I jumped to their aid (because I have the Suez Canal and would rather have Egypt next to it than France). Egypt surrendered before I could counterattack, but it came back as a single province nation when the war was over. I also demanded Normandy from France to keep a base close to those sneaky bastards
.
Score is:
Prestige: 3759
Industry: 6858
Military: 8421
Total: 19038
Other fun things include an independent Catalonia, communist Modena and Hamburg and
four Portugese attempts to conquer Zulu.
This is my first Paradox game, and I must say, haven't had this much fun with a video game in years
(despite the canned food).