American Writer Mark Twain in his works vividly records social changes caused by the industrialization in the 19th century. His writing could be regarded as a kind of construction of Americanism. He insists on advocating of Puritanism, using the American dialect to tell American stories, displaying the culture in American West and South. He employs humor and irony to combine American history with reality, getting rid of influences of the British literature to illustrate Americanism and the historical process of America.