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In the United States, there are essentially three categories of Muslims: 1) immigrants; 2) American converts/reverts to Islam; and 3) those born to the first two groups as Muslims.
The immigrant population of the United States is relatively easy to document because the Immigration and Naturalization Service, the Census Bureau, and other government agencies have been keeping records of immigrants. In order to arrive at our figures, we researched the history of Muslim ethnic groups around the world and then determined their percentage as Muslim. We then correlated this percentage with the number of Muslims in the United States, which enabled us to determine the percentage represented in the overall population.
Determining the number of indigenous Muslims was more difficult. In most cases, records have not been kept by any single source. To arrive at the number of American converts to Islam, we had to look at various groups' conversion rates and compare them against their mortality and fertility rates.
This is an on-going project, and AMC will keep the reader informed of new statistics through our quarterly publication, the AMC Report. The figures cited here represent a starting point for serious research on demographic data about the Muslim population of the United States.