Final answer:
Francis Scott Key was saying that Americans are brave.
Step-by-step explanation:
When Francis Scott Key wrote the words of what would become the United States' national anthem, he was saying that Americans are brave. The words 'the land of the free and the home of the brave' express the courage and bravery of Americans during the War of 1812. This message would have made Americans proud because it highlighted their patriotism and the sacrifices they made for their country.
Learn more about Francis Scott Key's message about Americans' bravery