I have a data set with Longitude and Latitude in decimal degrees. I had no problem getting the CSV into Arc and did Display XY data to create a feature class. I made sure the projection was WGS 1984 (it matches the other layers I have as well) yet the points are coming up off the western coast of Africa (they should be in Joshua Tree National Park).
It has been a little over a year since I booted up Arc and I just know I am missing something simple. Any help you can give would be great!