I think that one can point to several points of expansion since 1789. The most obvious way is through the addition of amendments. An additional 17 amendments have become a part of the Constitution. The strongest of these include the expansion of voting rights for people of color, women, and young people. Along these lines, the abolition of slavery, enforcement of citizenship rights, as well as the abolition of the poll tax, and different amendments that outline the function of the Presidency and Congress have helped to expand the scope and depth of the Constitution. The fact that the Supreme Court in cases such as Dred Scott, Roe v. Wade, Brown V. Board of Education, Plessy v. Ferguson, and United States v. Nixon have illuminated different reaches and parts of the Constitution to impact American life are also examples in which the Constitution has changed over time. Another way the Constitution has developed is with a greater understanding of the electoral college. The 2000 Presidential Election helped to give a crash course in this part of the Constitution, and more Americans understood the lesson which emerged.
Fours ways the U.S. Constitution has been developed since 1789
1791- Ratification of the Bill of Rights- guarantees of civil liberties
Marshall Court- The decisions in Marbury v. Madison, McCulloch v. Maryland, Gibbons v. Ogden, etc. expanded the governments Constitutional Powes
Reconstruction- the ratification of the 13th, 14th, and 15th Amendments- this expanded the rights granted under the bill of Rights
Warren and Burger Courts- Decisions here involving civil rights, the rights of the accused, and the penumbra of privacy