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.
Westward Movement and NativeAmericans Manifest Destiny was the belief that the United States wasdestined to expand from the Atlantic Ocean to the Pacific Ocean.As a result of this belief, more people in the United States movedwestward, and Native Americans suffered.