Which of the following is not correct?
1. every nation-state has a national government
2. national governments have a great deal of power
3. the modern world is divided into a mixture of nation states, city-states, and multinational empires.
4. national governments were invented less than 1,000 years ago.

following type of cultural development caused people to want and buy new products on the market :

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.