I used gangleri2001's blank world map to make this little dealie here. I'd note the absence of Hawaii and the Falklands on the map, though this wasn't really important for what I was doing here in any case. I bring you: Napoleon's New War.
I sketched something like this out on paper a couple years back after I'd read my first alternate history novel. After some revisions, primarily to things that were just plain too ridiculous, which resulted in this (frankly better) version of the map. It has more than one main PoD, which lends to this fairly unique situation in the year 1912 as the world's great powers descend into a world-wide conflict.
*Aztec peoples unify earlier than in OTL, and subjugate a far larger area. This leads to a far larger and more powerful Aztec Empire, which occupied most of what is today Mexico by the time of Columbus' voyage.
*A plague develops in Central America, to which the Native peoples are immune. Unfortunately for Hernan Cortes and his conquistadors, Europeans were not. The Spanish invasion was repelled by a combination of superior numbers and fatal disease, and the Aztecs quickly gained new technologies from Spain's enemy, England.
*A freak storm destroys Nelson's fleet at Trafalgar, allowing a French attack on British soil. Portugal falls to France, and the invasion of Russia in 1812 achieves far greater success than it did in OTL. All of Russia west of the Urals is annexed by the French Empire. Most of Britain's posessions in North America, and a portion of India, are taken by the French in the absurdly lop-sided peace agreement.
*Persia and Sweden join in to dismantle parts of imperial Russia, with Sweden seizing the Baltic states and with Persia capturing parts of the Caucasus and Turkestan. Though Sweden and Russia reconciled this incident (with Sweden leasing port access to the Russian navy), but relations with Persia remained strained.
*The new nation of Gran Colombia achieves far greater internal unity, and remains a single nation and a regional power in the Americas. The nation of La Plata (after its viceroyal name Rio de la Plata) also gains its independence. Uruguay gains its independence, only to become a satellite state of France, and Paraguay's owing its independence to Colombia leads to a military alliance between the two.
*The Opium Wars take a further turn for the worst, and Britain and France become involved in a frantic land-grab, each seizing half of the nation. In the chaotic aftermath, Russia annexes Mongolia and northern China.
Blue is the UK, Red is France, Green is countries allied to the UK, and orange is countries allied to France. Yellow is neutral. Who wins in my twisted, alternate WW1? Tell me what you think. You should operate under the assumption that most of the nations (except for perhaps the smaller ones and the ones in Asia) are fully industrialized.