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.
Americans also moved west at this time because their government made it possible and desirable for them to do so. The British were severely weakened in the Ohio Valley after their defeat in the Revolutionary War, even though the Indians who had been their allies remained a dangerous foe of the settlers.The Louisiana Purchase of 1803 signaled President Thomas Jeffersonâs desire for westward settlement and expansion.mericans began turning westward around the time of the Revolutionary War, when permanent white settlements began to be established in Kentucky, although hunters and fur traders had long traversed the wild lands beyond the Appalachians. After the war, a wave of eastern Americans flooded the Ohio River Valley.