"Countries that trade with each other don't go to war against each other."

This is from 'Global Capitalism: Its Fall and Rise in the Twentieth Century' by Jeffry A. Frieden :

'In 1900 international trade reached unprecedented levels and the world's economies were more open to one another than ever before. Then as now, many people considered globalization to be inevitable and irreversible. Yet the entire edifice collapsed in a few months in 1914'.

I recommend this book to however think, as I did before, that globalization is a new thing.