I look at the Rat Party as the experiment of socialism/communism that actually got started in 1932 under FDR.
There was a break during WWII from their march to socialism/communism.
So we are at the 70 th anniversary of their cycle minus the 4 years of WW II.
I think that we will see the Donner Party as you so aptly called it do a total implosion between now and the election of 2004. Then when President Bush is sworn in for his second term with massive majorities in Congress in 2005, that will be the final year of the current Rat cycle. That will be close to your 75 year cycle observation.
In the next two years we see the financial collapse of the socialist/communist states like Kalifornicator, Oregone and other states who tax and tax and then spend more than they can tax. This will destroy the Rats at the state and local level.
Goron Cities like NYC, DC, Atlanta, Houston, LA, San Francisco, Portland, Or and Seattle will become enclaves of the last of the rats. As they kill each other off, abort their children before they are born and die with short life spans due to aids and drug related health problems, in about two decades they will be gone. These dying cities filled with dying Rats will become hell on earth for the surviving rats until they leave us alone.
During those final years, these Rat enclave cities will make the Donner Party look civilized. Travel in and out of the Donner Party controlled cities will be banned with armed guards preventing people from coming and going to these dying Donner Party Cites.
Well then, Bon Appetit! I've heard tell it tastes just like chicken.
Historical note: Two of the Donner party, when they finally made it out of the Sierras, opened a restrurant in Sacramento. I joking refer to it as "The Donner's Cafe...Home of Fine Family Eating."