People are often confused with ' travelled / traveled ', 'benefitted/benefited', ' focussed/focused' and 'targetted/targeted'. This tip answers some of those queries. of any base where the preceding vowel is spelled with a single letter and stressed'. is not favoured in American English), so ' travel ' becomes ' travelling / travelled '.
According to the ngram below, American English adopted the one-l forms in the early 20th century. Many other verbs ending in -el went through a similar.
Canadian, British and American Spelling. Search tips. [Less common, less " correct" or travelled / travelling, travelled / travelling, traveled / traveling. traveller..