How did the Constitution change from between (1930s - Present)?

Answer 1

It changes by the amendments made to it. I think the voting age was raised. I can think of a few amendments in the 1920s, though....

Answer 2

Any online text of the Constitution (and there are hundreds) can tell you the amendments that were passed in that period. They deal with subjects like prohibition and repealing prohibition, extending the ballot to 18 year olds, limiting presidential terms and presidential succession.

But in practical terms, the Constitution also changes according to decisions from the Supreme Court. This is going on all the time, and the changes in this period have been extensive. Probably the most sweeping are the Civil Rights decisions, Brown v Board of Education and its successors, which implement the 13th, 14th, and 15th Amendments, actually incorporated into the Constitution shortly after the Civil War, but effectively allowed to lapse by the Jim Crow era and the Plessy v Ferguson ruling.

Also extremely important is the changing definition of the interstate commerce clause. This is very significant, since the Constitution gives Congress the power to regulate interstate commerce, without specifying how extensive this power is or what qualifies as interstate commerce. As interpreted by post New Deal courts, this gives Congress the right to mandate things like equal pay for women doing the same jobs as men for private employers, something which most Supreme Court justices prior to the 1930s would not have believed Congress had a right to involve itself with.

A third important set of decisions is Griswold v Connecticut and its successors (which include Roe v Wade), which goes in the opposite direction - limiting the power of both Congress and state governments over personal decisions about things like sexual practices and contraception. Prior to these rulings, it was illegal in many states for even married couples to employ contraception, as well as to engage in sexual acts other than intercourse.