Oh, well, for one: I'm Canadian. If I wanted to do a PhD (which I may) in Canada, I need the MA. Additionally, I went straight from high school to undergrad, meaning that I finished my classwork for my BA at 21 years old.Though I had a relatively strong application coming out of my BA, there were a lot of gaps in terms of my exposure to theory and I wanted an extra year to strengthen my application by taking extra year of graduate studies before starting the PhD. (It's actually helped a lot!) Also, I didn't do an undergrad senior/honours thesis, which many of my classmates have. This way, I have a MA thesis and some graduate coursework to make up for that.
This being said, I probably could have applied in the states for a PhD. One of my references suggested it to me. But, then we talked about it and he helped me realize that an extra year of studies after my four-year BA would help me mature as a student. I don't regret it at all. I'm funded for the MA and loving my research. The coursework is filling in some major theoretical gaps too, which is great. I'm also building some great academic connections and getting teaching experience.
I think my first choice is a certain school in the states and my second is in Canada, so I'm hoping that my choice to do the MA will help. (Hopefully it doesn't make me look bad for taking longer to get to the PhD for the states.)