Final answer:
President Woodrow Wilson asked for a declaration of war against Germany in 1917 to make the world "safe for democracy". This happened after the outbreak of the Russian Revolution and against the backdrop of Germany's aggressive policies, notably unrestricted submarine warfare. The United States Congress approved the declaration of war on April 6, 1917. So, the correct answer is option 2.
Step-by-step explanation:
The president who asked for a declaration of war against Germany in 1917 so that the world would "be made safe for democracy" was Woodrow Wilson. On April 2, 1917, following a series of provocations including Germany's unrestricted submarine warfare and after the Zimmermann telegram had been intercepted, Wilson went before Congress to call for a state of war with Germany.
This came just days after the Russian Revolution had begun, which paved the way for Wilson's moral stance, as it removed an autocratic regime from one of the allies, making it more palatable for the United States, a democracy, to join forces with them.
Wilson's address to Congress emphasized making the world safe for democracy and contained his vision for a postwar peace which was later outlined in his Fourteen Points.
This was crucial in shaping the modern international order and fostering cooperation between nations, notably between the United States and Great Britain. Ultimately, Congress voted to declare war on April 6, 1917, marking the United States' entry into what was then known as the Great War, later to be known as World War I.