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.
European Immigration: 1880-1920. Between 1880 and 1920, a time of rapid industrialization and urbanization, America received more than 20 million immigrants. Beginning in the 1890s, the majority of arrivals were from Central, Eastern and Southern Europe.