What are the main parts of the Constitution?

The main parts of the Constitution of the United States
are the various articles of that document.  There are seven articles, the first three of
which the most important.

The first three articles of the
Constitution lay out the powers of the various branches of government and set up the
methods for selecting members of those branches.  Article I deals with the legislative
branch, Article II with the executive, and Article III with the
judicial.

Article 4 through 7 are more miscellaneous.  They
do things like mandating that criminals (or slaves) who flee a state must be returned to
that state (or to their owners).  They set up the manner in which the Constitution can
be amended and they establish that the Constitution will be the supreme law of the
land.

Overall, though, the first three articles of the
Constitution are the most important because they set up our system of government.  In
this set up is contained some of the most important principles of the Constitution, the
idea of separation of powers, the idea of checks and balances, and the idea of limited
government.