Growth of Mandatory Spending in United States Budget
As mandatory spending in the U.S. has grown, it has take over a larger percentage of the federal budget, putting pressure on discretionary spending, which funds all scientific research programs.
As the growth of spending mandated by law has grown in the United States, it has put pressure on "discretionary" spending, which Congress authorizes on a yearly basis.
Discretionary spending has shrunk as a total of the federal budget over the years, as shown in this animation, even as total amounts have grown. This squeezes vital discretionary spending programs, such as space exploration and scientific research.