What might have been one advantage of walking completely upright

Probably the major advantage of walking upright was that it freed the hands to use tools and carry (the pray).

Another advantage is seeing further than on four legs, without the need to stop walking and raising oneself for a little while to look around ( like some animals do).

They wanted to make slaves out of them.they wanted force them to move off their landthey wanted to make them grow crops for very little pay.they refused to speak native american languages