It wasn't until 1969 that the band moved into socially conscious song writing with the release of the LP Willy and the Poorboys. Societal friction was treated in the single Effigy, while the burdens of the Vietnam War were considered in Fortunate Son. The latter of the two has become a true American rock classic, not only for what it says, but for the way it conveys its message. There's an unwritten caste system, if you will, in this country. People don't talk about it much.
Birth has a lot to do with it, power has a lot to do with it.
Those who don't, don't, and those who do, do. 4 Fortunate Son arguably became CCR's greatest classic, and definitely one of John Fogerty's greatest vocal achievements. In the movie, Gump had neither power nor birth, and therefore found himself on a helicopter heading to Vietnam to fight in a war which he did not understand. In 1970, CCR released Cosmo's Factory, their greatest selling album of all time, which continued the socially conscious musical style begun with Poorboys. The first single released off the LP, Travelin' Band, had as its B-side a tune which would later lend its title to a Nick Nolte film, Who'll Stop The Rain.