How did america become such a strong nation

Which is the best description of a scorched earth policy? the burning of fields in preparation for planting the destruction of an opponent’s resources the mobilization of a nation’s resources in war the effort to switch from farming to manufacturing

How would high tariffs hurt america? a. fewer immigrants would be able to move to america b. sales of american products to other countries would go down c. americans would sell more goods to other countries d. goods imported from other countries would cost less

How did inca develop their road system? a) they used mortar to hold the stones together.b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks.d) they laid roads in the cities, not in the less densely populated deserts.