American universities and colleges offer a myriad of courses and programs to choose from. You have the freedom to not only select the course content, but also the structure. At the undergraduate level, you have the liberty to pursue different courses before they you declare your major at the end of the second year. This helps to explore your subject interest and then decide without much hurry. Similarly, for your graduate studies, you can choose your preference and when you progress for your dissertation, you can focus on the ideas you want to emphasise upon.