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.
Talk of a transcontinental railroad started in 1830 as the use of railroads in the U.S. increased. At this time, settlers from the East began moving into California which was controlled by Mexico. The idea of a railroad to connect the East coast to California was popular. However, much of the early debate was on what route it should follow.