Practically American Canadians, pro-democracy Cubans, and Filipinos with some historical ties to the United States lead the way in the race towards the giant melting pot. These groups vary among native language but all ethnicities are known for a hard work ethic and popular strains in support for democracy.
The two main groups of immigrants not assimilating are Indians and Mexicans. The reasons for this are varied. Many Indians come here thinking they will only stay a short time, some resist because of their old age, while others have a similar to Western life style already. Mexicans resist because of geography and demographics. Mexico is so close and the Mexican community in America is so large that the need to assimilate is much lower.
The good news is that the various communities are still becoming Americans. Diversity is a strength but unity is a must. As the motto on the Great Seal of the United States goes E pluribus unum!