CRH entered the United States in 1978 by buying Amcor which is now called Oldcastle Inc .
Amcor is a concrete products group in Utah which would then form the basis of the company 's U.S. division .
CRH entered the United States in 1978 by buying Amcor , a concrete products group in Utah which would then form the basis of the company 's U.S. division , which is now called Oldcastle Inc .