Although the Presbyterian Church in America (PCA) is not yet fifty years old, its history and roots are as old as American Presbyterianism itself. Hence, the founding of the PCA represents and is indicative of the continuing presence of Reformed Theology in the United States. This paper will trace the origin of the new denomination from early American Presbyterianism to its formal establishment in December 1973, and examine its subsequent progress. First, the early roots of the PCA will be considered, followed by an extended presentation of the key events in the decline and preparation that led to its founding. The final part of the paper will examine the ensuing growth of the PCA since its birth.