https://www.quandl.com/data/MOODY/AAAYLD-Aaa-Corporate-Bond-Yield
The lowest AAA corporate bond yield in U.S history happened in 1946 based on the quandl chart above. Amazingly, it was even lower than today's yield given the world of negative yield in government bonds that we are facing today.
What were the historical economic and financial conditions during that time that led to the very low interest rate for AAA corporate bonds?