One reason is that recent immigrant groups, particularly Asians, are learning to play the same fund-raising and lobbying games that more established ethnic groups do. Another is that the cold war has ended. Sometimes such groups coordinate their lobbying with governments or political parties in their ancestral homelands. Even when they don't, they typically operate with a perfectly understandable sympathy for the welfare of those who live in such countries. An Albanian liaison.
Examples abound of the growth of ethnic lobbying.
The invasion of Haiti was mounted after heavy pressure from African-American leaders, who argued that democracy was as important for blacks in the Caribbean as for whites in Eastern Europe. These black leaders acted as emissaries between the White House and then exiled Haitian President Jean-Bertrand Aristide. Many of them coordinate their strategies with politicians and groups in Northern Ireland, including Sinn Fein, the political arm of the Irish Republican Army. The Mexican government coordinated with Mexican-American groups to drum up support for the North American Free Trade Agreement. Another measure is the growing diversity of ethnic campaign contributions.