What are Slave Codes and why did they exist?

He dust bowl that occurred in america in the 1930s is a dramatic example of erosion caused by a. deforestation b. overgrazing c. climate change d. agricultural cultivation

Natural resource consumption per person tends to be lower in developing nations as compared to developed nations. yet environmental degradation in some developing countries can be quite high.

Event : 1800s dual federalism / layer cake federalism effect on balance of power between local, state, and national governments : event : 1861-1865 civil war effect on balance of power between local, state, and national governments: event : 1933 new deal / cooperative federalism / marble cake federalism effect on balance of power between local, state, and national governments: event : 1964 start of great society effect on balance of power between local, state, and national governments: event : 1980s and 1990s new federalism devolution revolution effect on balance of power between local, state, and national governments: event : 2010 progressive federalism effect on balance of power between local, state, and national governments: