I believe its the oil crisis of 1973.
He launched Operation Linebacker. He bombed Hanoi and Haiphong that led to the
destruction of the North’s economic and industrial centers. He continued the bombings and also threatened to withdraw U.S. and end the agreement. Nixon halted the bombings and signed the
Paris Peace Accord that ended U.S. involvement in the area.
C. Johannes Gutenberg borrowed money to create the printing press.
