Day 17: Cannot, Can Not, and Can't

This is a part of the America English Langue that I've always thought was weird. Can't is a commonly used contraction for the word "can" and "not". Normally contractions are just replacements for the two words that are normally in that place in the sentence. However can and not are different in the US. The phase, "I can't do this." is grammatically correct while "I can not do this." is incorrect. Instead in the United States uses cannot as one word. I have no idea why this is the case, but I'd be very curios to find out.