Winston Churchill refers to the "Gettysburg ideal of government" in his 1941 speech to align his ideals with those of Abraham Lincoln, emphasizing the shared values of democracy and freedom that resonate with American principles. By invoking this ideal, he is drawing a connection between the struggle for these values during the American Civil War and the fight against tyranny in Europe at that time. Therefore, the correct answer is:
He is aligning his ideals with those of Abraham Lincoln in a speech that continued to resonate with American values.