Congratulations, you have experienced the classic "Right Hook". It's wrong and dangerous. A responsible driver would have waited the extra 15 seconds for you to pass, then made the right turn.

Here in WA State, the general rule is:

RCW 46.61.310
(1) No person shall turn a vehicle or move right or left upon a roadway unless and until such movement can be made with reasonable safety nor without giving an appropriate signal in the manner hereinafter provided.

There are more specific rules on how far advance a turn must be signaled, etc. etc. Oregon has similiar laws - I am sure a quick search will bring them to forward to you.