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 Expansion. The second major impact Jacksonian Democracy had was westward territorial expansion. Under President James K. Polk, the U.S. annexed Texas in 1845, signed a treaty with Britain to split the Oregon territory in 1846 and fought a war with Mexico the same year to claim California and the Southwest.