Final answer:
The quote is valid. Roosevelt supported the Lend-Lease Act and gave Britain military aid. After the attack on Pearl Harbor, Roosevelt declared war on Germany, supporting Britain.
Step-by-step explanation:
The quote stating that Roosevelt was actively pursuing a course that would take the United States into the war on the side of Britain is valid. Roosevelt supported the Lend-Lease Act, which allowed the US to provide military aid to Britain, and he gave Britain military supplies. Additionally, after the attack on Pearl Harbor by Japan, Roosevelt declared war on Germany, which strengthened US support for Britain. These actions demonstrate Roosevelt's willingness to support Britain and suggest that he was steering the US away from neutrality.