read the excerpt from jackie robinson’s letter to president eisenhower. when you said we must have self-respect, i wondered how we could have self-respect and remain patient considering the treatment accorded to us through the years. this excerpt contains an historical allusion to

Abarrier that transport

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.