For starters, in the States, you're not expected to actually specialise in a particular degree, but rather you major (this would be your main subject) in a field (e.g. English Literature), but you can amass, change, collect and fit particular courses to your tastes/needs. To put it plainly, you can pick 'n' mix your courses, to a certain extent. That's why some historians end up doing a course in astrophysics etc. Pretty cool, some might say. The fact you don't need to follow the 'straight and narrow', as it were, in your studies, means you get the chance to delve into fields that wouldn't normally be open to you in a UK institution.
Thanks to greater funding in the States, universities tend to have a better staff/student ratio, as well as envious collections of textbooks, state-of-the-art technology and a pristine reputation for some of the best teaching in the world. Harvard and Princeton aren't just known because of films like Legally Blonde (1 and 2), but rather because they've been around for centuries, offering year upon year a nearly faultless record for high achievement.
So why aren't we all going across the pond, to go study in some top colleges in the USA? Well, recent reports have shown that more and more students are, with over 500,000 enrolling in 2008/2009. With British universities now charging more due to recent top-up fees, many have made their way to live out the (academic) American Dream. Recent converts include none other than Harry Potter's Hermione, Emma Watson (Brown university).
What to make of two distinct systems, then? The major differences between the two are as follows:
1) British degrees are aimed at students who know what they want to specialize in, making swapping courses a lot more difficult if you're still not quite sure what you'd like to call your specific field of study.
2) US degrees allow for more flexibility - you can choose your specific degree up to 2 years in to your course.
3) British degrees tend to be 3 to 4 years long for a Bachelor's degree.
4) The workload between universities obviously varies, but whereas there is a form of continuous assessment in US institutions, in the UK you might experience long periods of study without having to hand in much - til the end of term, when all your deadlines seem to be conspiring against you! Organisation and the ability to work alone are key.
5) Fees: a degree in the UK will tend to set you back roughly £25,000, whereas in the US, it can be anything up to £100,000. There are, however, more scholarships available to students (local and international) if you decide State-side is the only way to go.
6) Prestige: although both US and UK degrees are world-renowned, some critics claim the Ivy League universities are worth every penny for the level of teaching, the resources available, and eventually, the opportunities available to graduates once they finish. Others argue British universities offer a clearer academic layout, with courses tailored to suit a particular field of expertise.
So there you have it, in a nutshell. You may decide that US campuses are just your kind of thing, or you might prefer to socialise and graduate in the UK - the decision is entirely up to you. There are grants and scholarships available, should you need a helping hand, both in the States and the UK. Speaking to current students can also help shed light on the situation, so why not get in touch.