The Amendment that the individual would likely encounter is
the 17th amendment. The 17th amendment focuses more on
the senate of the united states which they are composed of two senators from
each state that is elected by the people for about six years.
The 17th Amendment changed the Constitution to allow people to directly elect their U.S. Senators. The 5th and 6th Amendments- part of the Bill of Rights- both deal with the rights of the accused, while the 18th Amendment began the Prohibition Era in the United States.
The Truman Doctrine was established to aid nations that were fighting against communism. President Truman highly disagreed with communism, which is what lead him to creating the doctrine.