The Higher Education Act
The war on poverty.
Formation of medicare
It is not possible to calculate the true cost of LBJ's Great Society programs. Considering just one such program, MediCare, the unfunded mandate measures in the tens of trillions of dollars. MedicAid, another Johnson brainchild, is just as bad off. Social Security, Johnson's model, has been bankrupt almost since its founding in 1935; only "creative" accounting by Congress has maintained its flimsy reputation as some sort of 'trust fund,' funded of course with worthless federal paper.
Generations to come will reckon the cost of the Great Society programs.