Final answer:
Article 1, Section 8 of the Constitution gives Congress the power to declare war, which is a significant responsibility in the realm of national security and foreign policy. This power is one of several expressed powers granted to Congress, enabling it to govern and provide for the country's welfare.
Step-by-step explanation:
One of the powers of Congress listed in Article 1, Section 8 of the Constitution is A. Power to Declare War. Congress has significant authority in matters of war and peace, as this power allows it to officially declare war, a function that the President does not have. Furthermore, this clause gives Congress the unusual power of hiring privateers (pirates) to attack the nation's enemies under a letter of marque, should it serve national interests.
In addition to the power to declare war, Congress has other expressed powers which include the ability to levy and collect taxes, borrow money, regulate interstate and foreign commerce, establish federal courts, issue patents and copyrights, and regulate immigration and naturalization. These powers are part of what enables Congress to effectively govern and provide for the general welfare of the country.