Answer:
sorry I didn't understand ur question
Actually the sinking of the Americans ships was justified for Germany as they were trying to hind down supply ships for britain and the lusatannia was one that carried weapons to Britain. The United States of America knew that so they planned a war against Britiain but it didn't matter as then Germany sent the Zimmerman and payed for it by getting on uncle Sam's bad side.
esto no es realmente una pregunta, más bien un hecho