Final answer:
The Declaration of Independence was written because the British government had become destructive of the colonists' natural rights. It declared the reasons for rebelling against British rule and justifying the establishment of a new independent nation.
Step-by-step explanation:
Thomas Jefferson stated directly that the Declaration of Independence had to be written because the British government, under the rule of King George, had become destructive of the natural rights of the colonists. Jefferson argued that when a government fails to protect the rights of its people, it is the right of the people to alter or abolish it and establish a new government. The Declaration of Independence was written to declare the colonists' reasons for rebelling against British rule and to justify their decision to establish a new independent nation.