Well, university is now over for me

except for exams

.
Today I had my last day of history class and since we didn't have a final exam

(we've done four essays each worth 25%) we did something different.
So in lieu of a lecture or an explanation about a non-existent exam, our Prof decided to have an in class discussion by applying all that we'd learned or knew over the course.
The course was European history 16th to 20th century. The question the teacher put to the class was this: which has had the bigger influence on making the world what it is today, wars or ideas (reformation, renaissance, enlightenment, industrial revolution, etc)?
As someone who prefers history before the pre 19th century history, I prefer to rely on ideas being the bigger influence, but the other group brought up good points on the influence of World War I on destroying much of the old order.
So AH.com, since my classes discussion went cyclical, what are your opinions. War, or Ideas?