True
Explanation:
The Bill of Rights is comprised of Articles 3-12 of the constitution which are ratified subsequently and they together form what is called the Bill of Rights. Thus they are an integral part of the Constitution of the USA.
The Constitution had the earlier Bills ratified including the Article 2 as recent as the 90s but the first article of the Constitution was never ratified. The Bill of Rights is included in the articles 3 to 12.
