Aunque las guerras fueron comunes durante los siglos pasados en el continente europeo, la Primera Guerra Mundial se puede definir como la primera guerra moderna, entre otras razones porque A. se utilizó la mayor parte de los recursos humanos, incluida la población civil que trabaja en la producción de armamento.
B. fue una guerra industrial en la que las potencias ganadoras habrían de ser las que demostraran en el campo de batalla, una mayor capacidad tecnológica y mejor competitividad en el campo productivo.
C. comprendió el enfrentamiento de ideologías contrarias que amparaba los sistemas políticos y económicos como el liberalismo capitalista y comunista.
D. se evidencio una mundialización del conflicto. Participaron países de todos los continentes.

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In 911, a group of vikings lead by rollo besieged paris and chartres. after a victory near chartres on 26 august, charles decided to negotiate with rollo. the talks were led by hervé, the archbishop of reims. this resulted in the treaty of saint-clair-sur-epte, which granted rollo and his soldiers all the land between the river epte and the sea. it also granted him brittany, "for his livelihood". at the time, brittany was an independent land which france had not been able to conquer. in exchange, rollo promised the king his loyalty and military assistance when needed. also rollo also agreed to be baptised and to marry gisela, the king's daughter. the territory given rollo is about the same as upper normandy. this would grow to become normandy under rollo's descendants. - wikepedia