Why did Ernesto Miranda argue that his confession was not voluntary?

Even though Miranda had written his confession under a statement saying that he was fully aware of his legal rights, his lawyers argued those rights had not been made explicitly clear to him. Under the duress of detainment, they argued, his confession should not be deemed admissible. Jun 12, 2019

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the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.