Many career fields that do not require a specific major will be open to you after completion of your bachelor's degree. Certainly there are some career fields that require specific fields of study as preparation. For example, if you want to be a mechanical engineer, you will need a degree in mechanical engineering; if you want to be an elementary teacher you will need graduate education coursework qualifying you for a license. But there are many career fields where the relationship between your major and career field is not as direct.
