The indian constitution is the lengthiest in the world whereas the american constitution is the shortest one. Both the constitution declares thatthere is no official religion and no religion can ask for special treatment from the State.

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1.  the Indian constitution is the lengthiest written constitution in the world with 395 articles and 12 schedules where as the Constitution of 7 schedule
2.  in India there are 3 types of amendments where as the Constitution of USA the amendments are tough and rigid