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.
Effect of Manifest Destiny on Westward Expansion. The idea behind Manifest Destiny came from the thought that America was destined to expand from the Atlantic Ocean to the Pacific Ocean. This expansion was not to be considered selfish, but more of a way to extend the freedom and liberty of being an American to new places.