The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
There is no question here. We just have a statement.
What is your question? What do you want to know?
If this is a true or false question, then the correct answer is "true."
We can say that the different conceptions of federalism, as the system of federalism, have changed throughout U.S. History. Basically, what had happened is that the United States has moved from a system of dual federalism to one of cooperative federalism.
Particularly, after the Great Depression that started on October 29, 1929, there has been a more cooperative form of federalism as the powers of the federal government expanded. Indeed, President Ronald Reagan expressed in the 1980s that there was going to be new federalism in the US.