The acceptance of this famous document in 1776 performs as a kind of "crossway" moment for the whole history of USA. Since that time the wealth and the political significance of the United States started to increase rapidly, as well as the final assertion of a high-level legal system and the germs of democracy. USA went through the hard times and managed to relive the dark period of its history, though the price for the freedom was really high.

According to the motto of the leaders who pushed the revolution, the main things for Americans to fight for are invaluable joy of living, being free and having the right to keep his or her own property (Sounds terrible but some time ago people deprived of this common right). The American nation has been taught to break the limits in order to build the lightest future and that's why the Declaration stays one of the most important and significant documents among the American nation.

If the Holy Bible teaches people how to be righteous, the Declaration reminds to everybody the value of the freedom of choice, speech and living - the ancestors once gained for them. That's why it's so sufficient to remember the roots of the document that changed the lives of millions of people.

More Info: en.wikipedia.org