america außenpolitik conditionséconomiques diplomaticrelations diplomatischebeziehungen economicconditions economichistory foreignrelations general globalization greatpowers großmacht hegemony histoire history hégémonie imperialism imperialismus impérialisme internationalepolitik paix paxromana peace peacefulchange(internationalrelations) politicalscience relationsextérieures universidadsergioarboleda