I'm dating an American girl but my mom is pressuring me into arrange marriage. I don't know what to do about it?

My mom said she will always support me but she has stopped talking to me. My sister married 2 times with mom's support. Both were not arranged marriages. Now she is emotional blackmailing me to marry her choice of girl. She wants me to stay with her in India. I want to marry and live in US.

I'm dating an American girl but my mom is pressuring me into arrange marriage. I don't know what to do about it?
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