Quick answer for 44 points why did the chinese rebuild the great wall in the 1400's

Many scandinavians immigrated to the united states as a result of the homestead act of 1862, which offered land to independent farmers. this is an example of a push factor, because turmoil in scandinavia encouraged people to leave. push factor, because a new opportunity encouraged people to come to the us. pull factor, because turmoil in scandinavia encouraged people to leave. pull factor, because a new opportunity encouraged people to come to the us.

What notable contributions to science has sandia national labs (snl) produced over the years?

The source of wealth for the city-states of the east african coast was trade between the interior of africa and the far east. true false