What did Kerosene allow people to do all across the nation?

Kerosene allowed better lighting throughout the country.

Explanation:

When kerosene refinement became possible, kerosene became a very cheap and affordable fuel for virtually all citizens of the country, making it a strong fuel to be used in lamps, when the country did not have an electric lighting system efficient as today.

In some underdeveloped countries where electricity is still deficient or poorly distributed, kerosene is still used to light houses at night when sunlight is not available.

disequilibrium means that either supply is greater than the demand for an available good, or that the demand for a product outstrips the available supply. it implies that the price for a is either too low creating large demand, or too high creating a large surplus of supply.

b.

jim crow laws were enacted in northern states.