The united states shall guarantee to every state in this union a republican form of government, and shall protect each of them against invasion. according to this quote, the job of protecting the nation from foreign enemies belongs to

The national government

Explanation:

Because oft his , the government was given with the full power to mobilize the military that is funded through tax payers' money. The threats that included under U.S constitution does not only cover the foreign invasion that come from outside of the country. The constitution also require the government to protect the citizens from the threats that come from internal part of the country.

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long