Suicide of a Superpower and Death of the West by Pat Buchanan, short books from the 2000s, he may have written some before then too. Found in some libraries.
Also, I think Michael Savage has been plugging this for a time and he has written books.
But Anne’s book is accurate.
But Ann imo explains it best in her book how by increasing the number of leftist in the USA through 3rd world immigration the democrats are using that growing number of leftists to move the USA toward becoming a socialist hell hole. the USA has always moved to the left ,more government every year. Since democrats are importing 1 million 3rd world leftist immigrants every year since 1970 and the same number of illegal leftist then they are outnumbering Americans , so they can outvote us.
Barak Obama would never have been elected if the democrats hadn't imported 55 million leftist 3rd world immigrants into the USA to vote democrat. since 1970 democrats imported more than 50 million leftist 3rd world immigrants.
http://www.amazon.com/Adios-America-Ann-Coulter/dp/1621572676