About NCMA. NCMA is the national trade association representing the producers and suppliers of concrete masonry products, including concrete block, manufactured stone veneer, segmental retaining walls and articulating concrete block. For over 100 years, the Associationâs mission remains to advance, protect and promote the common interests of its members.
Between 1803 and 1853, the United States almost tripled in size. In the early 1800s, the land west of the United States was very undeveloped.
In less than a century, westward expansion stretched the United States from a handful of states along the Eastern Seaboard all the way to the Pacific. The acquisition of Hawaii and Alaska in the mid-19th century assured westward expansion would continue into the 20th century.n less than a century, westward expansion stretched the United States from a handful of states along the Eastern Seaboard all the way to the Pacific. The acquisition of Hawaii and Alaska in the mid-19th century assured westward expansion would continue into the 20th century.