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.
One factor in encouraging settlers to move west was the Homestead Act, passed in 1862, which allowed settlers to claim 160 acres of land for free. Another important factor was completion of the first transcontinental railroad in 1869 which led to much more rapid Western migration.ne factor in encouraging settlers to move west was the Homestead Act, passed in 1862, which allowed settlers to claim 160 acres of land for free. Another important factor was completion of the first transcontinental railroad in 1869 which led to much more rapid Western migration.