Federal is defined as a. the administration of law b. a union of states under one national government c. enthusiastic support for one’s country and way of life d. the doctrine that citizens have power to decide how country should operate

B. a union of states under one national government

Explanation:

In a federal government, power is split between a central authority, such as the national government,  and constituent political units, such as each states´ authorities.

Federalism is beneficial for a country like the U.S., with such a diverse population. However,  conflicts in authority about whether something is a federal or a local government issue.

b) to encourage free trade

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.