I think the last one is correct because Robert created ways trough Missouri River to get faster to the ocean
C. new tech.....................................................................................
Sometimes it's for religions . <span />
The Vietcong were rebels in South Vietnam who wanted to "<span>unify the South and North under a Communist government". They were great rivals of both the US and the South Vietnamese governments. </span>
Answer: The Maya experienced severe environmental pressures, including rising sea levels and intense droughts. They responded to these by turning forests into wetland field complexes to grow ancient food species, including maize.
hope it help you and sorry you just report someone because his didn't answer sorry if your angry sorry and sorry again you can report me if you want i just want to say sorry anyways
