During which era did detente mainly occur ?

The 1970s after the Cold War.  

1970s

Explanation:

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lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.

the main concern with the first draft of the articles of confederation was too much power in the state governments.