Final answer:
The energy crisis in the 1970s was caused by various factors, including the United States' support to Israel during the Yom Kippur War.
Step-by-step explanation:
The energy crisis in the 1970s was primarily caused by multiple factors, one of which was the United States' support to Israel. In response to the US support for Israel during the Yom Kippur War in 1973, the Arab oil-producing nations imposed an embargo on oil shipments to the United States, leading to a shortage of oil and a significant increase in prices. This had a lasting impact on the US economy and highlighted the nation's interdependency on international political and economic developments.