Excuse me for a simple question. I have CSV files of X,Y data (in decimal degrees) that I want to add to a map and view with a shapefile of level III ecoregions that I downloaded from the USGS website. Seemingly very simple I know, but when I add the points using "Add delimited text layer" and used the closest coordinate system I could find to the USGS shapefile the two layers do not line up. In argis I remember when adding X,Y data you could define the coordinate system of the new file based on the coordinate system of another existing shapefile rather than selecting from a list and hoping that the right one is there. Is there a way to do this in QGIS? I obviously dont know much about GIS software, and this is the #1 biggest problem I have with getting started on any project - making the coordinate system of two files match up! I would so appreciative if someone could help get me started! Thanks in advance. Sorry if my question is unclear or jumbled.... again the novice thing.