One key difference is that the Irish and Italians in Massachusetts were both European immigrants, while Cambodians and Mexicans in California are from different continents and cultures. This difference may have made it more difficult for the Cambodians and Mexicans to assimilate into American society and could have contributed to tensions between the groups.
Another important factor to consider is the historical context in which these groups arrived in the United States. The Irish and Italians immigrated to the US during a period of rapid industrialization, when there was a high demand for labor. In contrast, Cambodians and Mexicans immigrated during a time of economic recession and increased competition for jobs. This could have made it more difficult for Cambodians and Mexicans to find employment and could have contributed to tensions with other groups.
Finally, it is important to note that the experiences of Cambodians and Mexicans in California are not monolithic. There is significant diversity within both of these groups, and the experiences of individual members can vary greatly. Some Cambodians and Mexicans may have had positive experiences of coexistence, while others may have faced challenges and discrimination.
In conclusion, it is difficult to say definitively whether Cambodians and Mexicans in California coexist less easily today than did Irish and Italians in Massachusetts a century ago. There are many factors that could contribute to differences in the experiences of these groups, and it is important to recognize the diversity of experiences within each group.