Which soviet general secretary denounced stalin and encouraged his country to
support an active space program?

The right answer is Nikita Khrushchev.

Explanation:

After Joseph Stalin´death and the internal power fight that followed it, politburo member Nikita Khrushchev emerged as the new secretary-general of the Communist Party of the Soviet Union in 1953. In February 1956, he delivered a famous close-door-session  speech to the 20th party congress that sent shock waves to the whole communist world. In the speech, Krushchev critized Stalin and his ruling style, the purges of innocent comrades and people and many mistakes he had made.

Nikita Khrushchev

Explanation:

He was also the first secretary of the Communist party of the Soviet Union too.

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explanation:

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )