Answer:
The speech was about the war against terrorism and the phrase "Free nations will press on to victory" relates to the theme because it refers to freedom against tyranny.
Explanation:
When George W. Bush proclaimed the phrase "Free nations will press on to victory," he was referring to the free nations, which would defeat the terrorists who were people without freedom, fighting for tyrannical and evil ideals. With these words, Bush reinforces the theme of freedom as a justification for the war on terrorism.