One which I brought up elsewhere in the thread is an old one - that Europe discovering, plundering, and then exploiting the Americas gave them the boost they needed to extend that hegemony to the rest of the world. They 'lucked out' into finding a bunch of 'easy targets' and a massive amount of land once they were done butchering.
Noneofurbusiness brought up capitalism, which is another common explanation - capitalism, for all of its faults, gave Europe in the 17th century AD an unprecedented period of sustained growth, which not only fueled Europe's ambitions, but also the later Industrial Revolution which would extend its advantage even further.