<span>B. reduced tensions with the Soviet Union
</span><span>The SALT talks of the 1970s helped in limiting the nuclear weapons of USA and Soviet Union in their arsenals.</span>
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Answer:
I believe it is C
I asked my history teacher about this and she said it is right. Also I believe trade these days does not relate that much to political history.
So sorry if I am wrong
The fundamental modernization of ribbed groin vaults in Gothic cathedrals was to accommodate stained glass window. The ribbed groin vault is the connection of two or three barrel vaults yields a rib vault or ribbed vault when they are bordered with an armature of piped masonry often engraved in decorative patterns and associate groin vault is an older custom of vault structure.
Quipus, it was a Inca invention for recording information