Final answer:
Baltimore's importance during the Revolutionary War can be attributed to its strategic location and the defense of Fort McHenry against British attacks.
Step-by-step explanation:
The importance of Baltimore during the Revolutionary War can be seen in its strategic location and its significance as a crucial harbor. Baltimore's harbor was defended by Fort McHenry, which played a vital role in protecting the city from British attacks. In 1814, the British Army and Navy launched an assault on Baltimore, but the defenders of Fort McHenry successfully repelled the attack, inspiring Francis Scott Key to write the national anthem, 'The Star-Spangled Banner.' Additionally, Baltimore's resistance against secession during the Civil War further showcased its importance in American history.