How is the principle of states' rights reflected in the declaration of independence or the articles of confederation?

The correct answer is the following.

The principle of the State's Rights reflected in the Declaration of Independence or in the Articles of the Confederation in that those principles of the State Rights gave the states of the country more liberty to decide about their own issues, instead of being totally dependent of the federal government.

The principle of State's Rights was discussed during the creation of the US Constitution in 1787. It was one of the most important debates held by the delegates. Many delegates believed in the necessity of a federal government but not so powerful that could hurt the interest of the states. They consider that the federal government should have limits and not interfere so much in the state's issues.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.