Which constitutional principle did president truman violate?

President Truman violate violated the separation of powers principle. This is the idea that a Government's power should be split up between different branches to avoid one arm having too much power. Truman violated this principle President Harry Truman asserted a unilateral executive decision to go to war.

probably 3 since archeologists and historians don’t understand there writing.

answer; obey the closest relative's wishes;