Buddhism taught that anyone could enter Nirvana, no matter how lowly they were on the social scale. Hinduism taught that only the Brahmins, members of the highest caste, could achieve entry into this wonderful state of peace. It is not surprising that the lower castes preferred the teachings of Buddhism. I hope this is helpful
congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.