Why is it important to understand why seemingly successful and strong civilizations fail?

The 14th amendment overruled the supreme court case of dred scott vs. sandford. the landmark supreme court case determined which of the following points? a.slaves could not be citizens b.non-landowners could not be citizens c.blacks could not be citizens d.all persons born or naturalized in the united states vary differently in citizen status.

Match each model with its name and the name of the scientist who created it.

Brainliesttt !me : ) describe the event : increase in islamic extremis in the middle east