Political, military and economic pressures along with global alliances and territorial disputes were all factors that led to World War I in 1914 and a second world war that began in 1939. With those same pressures evident today, is WW III a possibility? What might be the tipping point in the spread of regional conflicts that could set off a global war? USA TODAY World Affairs Correspondent Kim Hjelmgaard joins The Excerpt to discuss current wars and what a world war looks like in the 21st century.

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