I was a member of the AMS in 2014, but my school had cut funding for 2015, should I still list I was a member in 2014 on my CV?
When you did some work for the organization (e.g., organize a local conference or chapter meeting), you can put exactly that (e.g. 'co-organized annual XYZ regional meeting in 2014').
When you have built up a network relevant for the employer through the organization, you might also list your membership.
Otherwise, leave it out.
It depends on the target of your résumé
- If the company is (uninformed) and (uninterested) you get no particular advantage for putting that. Then, why putting that?
- if the company is (uninformed) and (interested) you could win a small advantage by doing so.
- If the company is (informed) and (uninterested) see case 1
- If the company is (informed) and (interested) then they will ask you during the interview, and feel deceived when you tell them that this is a contact that they will not be able to take advantage of. So it's a loss on your side and may harm your chances of getting a job.
I cannot see a clear win in putting that, so I would remove it. Maybe being member you went to a conference, or shared some presentations to them, or did something for them. Focus on that instead.