Help me translate this passage.

Despite many obstacles and uncertainties, millions of people are still pouring into the promised land-America. But what drives so many people to emigrate under such unfavorable conditions? There may be as many reasons as there are people pouring into the United States. This is a very personal decision. But it can also be summarized as three main driving forces-religious persecution, political oppression and economic difficulties, which provide the most important driving forces for American immigrants. They are responding to the promise of the Declaration of Independence in their own way: the promise of freedom of life and the pursuit of happiness!