Was the United States justified in their reasoning for seeking independence from Great Britain?

Great Britain was taxing the citizens for not a very good reason

Although England has many reasons as to why the colonies were unjustified in waging a war, the colonists still were justified because the “Declaration of Independence” clearly stated the colonist's problems against the king. They said that they were breaking away from England to become The United States of America

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.