Custom of american government that has most resulted in new interpretations of the constitution

As defined in Quora.  

Of the three branches of the United States Government, executive, legislative and Judicial, the judicial branch is responsible for and interprets laws and applies them in all cases of legal dispute.    Though both the Executive or the Legislative can disagree and/or choose to not enforce existing laws.  Only by challenging the existing interpretation will the Supreme Court be called upon to hear arguments and render a decision on what is the intent in the wording of the constitution.  If required, amendments to the constitution my result.

it was justfied as english were being brutal to the colonist and they needed to be stopped therfor causing a war but the moral over that is yes it was justifed

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers