What was manifest destiny and why did it inspire a burst of american expansionism in the 1840s

 Manifest Destiny is the urge of Americans to expand their country's size.

Explanation:  Both government and individual felt nothing should stop the all-powerful drive to expand the size of the country.

d: social contract theory

1.the population change is near or at replacement level.

4. the birth and death rates are balanced.

6. sweden is most likely a developed country.