How exactly do i get charity organizations to stop sending me letters asking for donations, permanently?

Well, first, mail solicitations for donations are especially common around the holidays.  You need to bear that in mind. It may explain why you've recently received many.

But second, there really isn't any way to end mail solicitations. The best you can do is just toss them unopened.  The fact is that once your name is in the database, it is just about impossible to get it out.  Even if someone claims to you that it's been removed, it probably will not have been.

My husband works for a major non-profit, one you've heard of since your childhood, and he oversees donation records for a large swath of the country.  He would tell you that there's really no way to stop these mail solicitations.  He frequently hears from his gift managers that they've just found someone who's been dead for years in the database but who is still receiving (or his heirs are receiving) solicitations.  They try to remove them, but then the names pop up elsewhere in the system.

He calls this "the persistence of bad information," and it seems to persist no matter what they do.

Don't hesitate to toss them. They're not like plastic; they won't be cluttering up the landfills forever

Charities are like Sweepstakes, once on the list, even Dying won't get you off them. Just toss them out. 

I get a TON of political flyers every election time-and I mean like 50+ from EACH candidate. One year, the local politician died in office and there was an emergency election to fill his spot. In the course of 2 weeks, I got 149 flyers from both candidates. 

I kept them all, put them all into and envelope and sent them all back postage due, with a nasty note that said i MIGHT have voted for you , if you didn't kill so many trees. 

Do you have a trash can at your house? If you do than throw the letters there and every letter you get from charity Organizations?

All you can do is ignore them. If you donate to one charity giving your name and address, that charity rents its mailing list to other charities for a fee. They send you more mail. 

There is not much you can do. You can contact the first one you gave to and each one you gave to, and see if you can get them to delete your name. Once your name is deleted from the mailing list of the charity renting your name to the others, it will not go to them again. But that is if you can get the first one to take your name off the list. 

just write to them and ask them not to. i just trash them

It seems the more that you respond to them the more male they send you.