The USA will become the key player in a series of make-or-break decisions and either condemn us to a century of violence and poverty, or usher in a new age of global co-operation.
But he cautioned the peaceful alternative is only possible if the world realises the age of individual nation states is over and an effective system of global governance is introduced.
Flashpoints of world politics such as climate change and the rise of China and India, as well as the global credit crisis, will need international co-operation to be resolved.
Professor Boyle said: “2007 started off colossal economic change which has still got a long way to go.
“Big economic changes lead to big political changes and we have not seen them yet.
“My thesis is that we have got another crisis to come, and you can already see that in the questions being raised over the debts of nations rather than private credit debts.
“One thing that has not changed is the colossus that is the American military which means the USA has to be a key player in any major political shift.
“We are going to see disparity in America's perception of its declining economic significance and continuing military and political absolute power.
http://www.telegraph.co.uk/news/newstopics/howaboutthat/7832724/2014-will-determine-course-of-century-says-Cambridge-professor.html