I recommend that you
check out the New Historical Atlas of Religion in
America for general history and statistics on religious change
in America. The section on
“Denominational Predominance in U.S. History”, starting on p357, gives quick
background information on how the American religious landscape has changed since
the colonial period and the chapters specific mainline Protestant denominations include
maps and charts on membership trends.
For statistics on
immigration to Somerville, I recommend using Social Explorer (a library e-resource).
This tool presents historical census data for the United States
through the use of interactive maps and reports. Currently provides access to
data from 1940 to 2000 at census tract, county, state and national level. This
tool can be used to find the percentage of foreign-born residents in Somerville and their
countries of origin. If you would like help using Social Explorer, please stop
by the Research Services offices to consult a librarian.