Given the amount of places around the world that English is spoken, various differences are bound to emerge. Despite how much the USA and UK have in common, there are enough differences between their two versions of the English language that someone may not always understand exactly what someone from the other country is saying. Fortunately, the US State Department has created a series of useful graphics to help clear things up.
The US and the UK’s imperial histories and modern influence over the world have changed the English language forever. Because it was exported to countries all over the world, it has been forced to accept different.