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Quel événement symbolique marque le tournant vers l'impérialisme pour les États-Unis à la fin du 19e siècle, et quel influent homme a encouragé cette transition vers une puissance maritime ?a) La déclaration de guerre contre l'Espagne en 1898, sous l'impulsion de Theodore Roosevelt.b) L'achat de l'Alaska en 1867, suite à la recommandation de John Quincy Adams.c) L'annonce qu'il n'y avait plus de nouvelles terres à explorer sur le continent américain en 1890, soutenue par Alfred Thayer Mahan.d) L'expédition de Lewis et Clark de 1804-1806, dirigée par Thomas Jefferson.

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