Why do people need to form governments for themselves?

What principle did president truman invoke in sending u.s. troops into south korea without first asking congress to declare war?

:) during the cold war, people were afraid of communists, both outside and inside the united states. the red scare and mccarthyism that grew out of these fears were damaging to the american way of life. during the mccarthy years, many of the freedoms guaranteed in the bill of rights were limited. write a paragraph explaining what lessons can be learned from the mccarthy era about what u.s. citizens need to protect in order to preserve the democratic political system and the american way of life.

Why is james madison significant in regards to the bill of rights?