President Carter's foreign policy failures included O not being able to bring Egypt and Israel together.
not being able to bring home the Iranian hostages.
not being able to promote détente with China.
not bringing the Shah of Iran to the finited States.

not being able to bring home the Iranian hostages

Explanation:

President Jimmy Carter held the presidency during the Iranian hostage crisis  in 1979. The crisis started after a group of militarized College students  who supported Iranian revolutions attacked the United States embassy in that located in Tehran and took 52 hostages.

The crisis lasted for 2 years and wasn't solved by the Time Carter's presidency ended.  The crisis ended after Ronald Reagan took the presidency in 1981 and signed the Algiers Accords,

the answer is use of support  

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