To cause a source to be biased means that it is influenced by your opinion or another factor that is not factual. Bias can take away from the credibility because it is not completely true, as a source should be.
The program that was created as a part of the "Great Society", provides hospital insurance for Americans age 65 or older is Medicare.
The Appilachian mountains was the greatest barrier, because it was crawling with Indian's that may have made them turn back.
The War in Vietnam led to Communist control of the country, and also to the unification of North and South Vietnam.
