问题描述：
英语翻译
Despite the obstacles and uncertainties that lay ahead of them,millions did migrate to＂the promised land＂---America.But what was it that moved so many to migrate against such overwhelming odds?There were probably as many reasons for coming to America as there were people who came.It was a highly individual decision.Yet it can be said that three large forces---religious persecution,political oppression and economic hardship---provided the chief motives for the mass migrations to America.They were responding in their own way to the pledge of the Declaration of Independence:the promise of ＂life,liberty and the pursuit of happiness＂.
Despite the obstacles and uncertainties that lay ahead of them,millions did migrate to＂the promised land＂---America.But what was it that moved so many to migrate against such overwhelming odds?There were probably as many reasons for coming to America as there were people who came.It was a highly individual decision.Yet it can be said that three large forces---religious persecution,political oppression and economic hardship---provided the chief motives for the mass migrations to America.They were responding in their own way to the pledge of the Declaration of Independence:the promise of ＂life,liberty and the pursuit of happiness＂.
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