How did the seizure of the u. s. embassy by iranian students affect u. s. cold war policy

The crisis of hostages at the American embassy in Tehran was the worst foreign policy crisis of president Jimmy Carter.  66 American diplomats and citizens were held as hostages by Iranian revolutionary militants. The Iranian Islamic revolution was young then. Hostages were kept in custody by the kidnappers for over a year. The US government and other diplomatic allies attempted to negotiate with the Iranians but to no avail. The US administration froze Iranian assets in the US, stopped buying oil from Iran and launched a diplomatic offensive. The crisis was a PR disaster for a president that was looking for reelection. Carter sent  a rescue mission that failed due to poor planning.  The issue poisoned Iranian-American relations for decades. The crisis contributed to a hardening of US Cold War policies and a conservative turn in politics, all expressed in the election of Ronald Reagan as president on November 4, 1980.

Explanation:

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.

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