How difficult is it to get a college level teaching job with only a MA

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I have a degree in secondary English Education (grades 7-12). I love teaching however after finishing my student teaching I have decided I do not want to teach at the middle/high school level. I would ultimatley like to get a PhD in British Literature or Linguistics and teach at the college level but it will take me some time to get there. At this point I am trying to decide which course to pursue for a Master's degree. If I get my Master's in English I would like to teach part time or as an adjunct professor at one of our many local colleges. I just do not know how easy these jobs are to get. Most colleges only require the Master's and preferably some experience. I just would hate to get the degree and then not be able to to do anything in the English field unless I have a Doctorate. My other choice for a master's degree is Adult education? Anyone have any suggestions or input?