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I would just show them. Make a wheel and give it to them and things like that.
About slave - I would take some weapon with me before journey. Think that would be enough.

They already had the wheel invented. But lets say you have a machine gun with 1000 bullets all up. You could probably massacre a whole bunch, but once you run out you'd be overrun, coz they probably had thousands of soldiers. If you brought a tank that would be different

About that gun thing look how white ppl conquer America. There was more native people and white ppl didn't have machine gun. But still gun was a technology that was unknown by natives and they was scared of it.

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