well 6 billion is a lot so I'm thinking the human race
idk i feel like in 2 - 3 decades an arabic mixed ethnicity is going to take the majority considering the mass euro immigration\\
it isn't specified how far into the future it is when you've committed genocide. what if some health advancement causes you to live for a few extra hundred years if not indefinitely? we could be talking about a world with 20 billion people and has highly advanced weaponry that no-one could stand a chance against.
@OP is it even possible for us to kill the time traveler?