What's the differences and similarities between America and Britain?

1.pronunciation
2.spellings
Am. English usually spell the words in a short way:coenter(Am.)<=> centre(Br.)
3,grammer
in Am. English,they might ask:"Have you got a pen?" But in Br. English, they say:"Do you have a pen?"

抱歉还在念中学，因此能力有限~

What's the differences and similarities between America and Britain? Please reply in English as soon as possible. I am expecting for the answer...

the differences and similarities between America and Britain are hen duo hen duo

dude```in which way? need you elaborate it. and without your elaboration the answer could be a 100 pages long essay~~