How was the Indian caste system similar to racism in the US?

Indian Caste System is not like racism in the US. Racism was not originated in the US but it was produced soon after the British founded a strong base in the southern part of the US. Racism is not descent based. Racism doesn't have any touchability or untouchability issues. Indian caste system is descent-based. A Hindu is born with caste, lives with caste and die with caste. An American is not born with racism. Indian caste system is monstrous endogamic in character. Purity and impurity is the basis of the caste system. A casteless Dalit's touch will pollute a caste person. But the touch of an African American doesn't pollute a white American. Racism is purely class-based, where as casteism is caste-based and there is no place for caste-ridden society. Hinduism is caste and caste is hinduism. If caste is annihilated hinduism will be annihilated; or if hinduism is annihilated, caste will be annihilated.