AbstractEnglish is an important tool in international communication
With the development of society, the two variants of English, British English and American English have changed significantly
There are a lot of differences between American English and British English, and the reasons for their differences lie mainly in three aspects: histories, politics and cultures
This thesis is trying to analyze the historical, political and cultural reasons leading to the differences between American English and British English, and trying to present some typical examples of differences in vocabulary, spelling and grammar
At last, it points out the significance of learning the differences between American English and British English
Key words: American English; British English; differences; reaso