How does federalism allow national, state, and local governments to affect one another? Give examples

the answer to number 5 is fort sumter

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.