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.
1 Purchase. 2  Americans bought some of the land. 3  In fact we began our first westward movement with the purchase of land in 1803 and we finish our desire to bring the North American continent under U.S. control through a final land purchase in 1853. 4  Louisiana Purchase, 1803 - Bought from France, $15 million.