According to the declaration of independence, when a government takes away the people's rights to life, liberty, and the pursuit of happiness, what are the people allowed to do?

According to the Declaration of Independence, when a government takes away the people's rights to life, liberty, and the pursuit of happiness, the people has the right to overthrow that government, which is known as the right of revolution.

Explanation:

The right of revolution or right of resistance to oppression is a right recognized to the people against rulers of illegitimate origin or who having legitimate origin have become illegitimate during their exercise, which authorizes civil disobedience and the use of force with the order to overthrow them and replace them with governments that have legitimacy.

The right to resist the tyrant, who has come to justify his death, can be found in antiquity. Thus already Plato dealt with the issue of tyranny and the right of the people to defend themselves against the tyrant and injustice.

This right can be considered implicit in the Declaration of Independence of the United States of 1776, which in its most famous paragraph states:

"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.  That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness".

true is the answer to this

four sitting presidents have been assassinated while in office but the first was abraham lincoln,