How does evaluating a source help researchers form opinions?

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

How can we stop u.s. military drone strikes from hurting innocent people

Which of the following was a major effect of paul's conversion to christianity? christianity became the official religion of the roman empire. the teachings of christianity were banned by pontius pilate. christians began to debate whether jesus was resurrected or not. the teachings of christianity were spread to non-jews called gentiles.