Seward’s Folly refers to the "<span>(C) United States’ purchase of Alaska," since this deal was made by William Seward, and was seen by many at the time as being a waste of money. </span>
Slave owners turned to cotton production as a way to prosper due to its high demand and so did the demand on slavery.
Explanation: Nixon used the new US closeness to China to negotiate the agreement with the Soviet Union
I hope this helps!