According to the Declaration of Independence why do people set up a Government?

According to the Declaration of Independence, people establish a government to secure their unalienable rights, which include life, liberty, and the pursuit of happiness. Governments are formed to protect these rights and to ensure that power is derived from the consent of the governed. When a government fails to uphold these principles, the people have the right to alter or abolish it. Thus, the primary purpose of government is to serve the needs and protect the rights of its citizens.