Reference books are great places to begin your research. Buley Library has many encyclopedias that can give you an overview of a topic before you begin looking for more specific information.
Encyclopedia of the Irish in America
The Italian American Experience: An Encyclopedia
Encyclopedia of Japanese American history
Chronology of Hispanic-American History: From Pre-Columbian Times to the Present
The Oxford Encyclopedia of Latinos and Latinas in the United States
Encyclopedia of American Jewish History
Encyclopedia of African-American Culture and History: The Black Experience in the Americas
Encyclopedia of the Great Black Migration
The Gale Encyclopedia of Native American Tribes
Encyclopedia of Islam in the United States
American Immigrant Cultures
We the People: Atlas of America's Ethnic Diversity
Encyclopedia of New York City
Countries and Their Cultures
Worldmark Encyclopedia of Cultures and Daily Life
Encyclopedia of Mexico : history, society & culture
The Encyclopedia of Ireland
The Oxford Encyclopedia of the Modern Islamic World
Encyclopedia of the Jewish diaspora : origins, experiences, and culture
Encyclopedia of India
Southeast Asia: A Historical Encyclopedia, from Angkor Wat to East Timor
China Today: An Encyclopedia of Life in the People's Republic
Africana: The Encyclopedia of the African and African American Experience
Encyclopedia of African History and Culture