In 1989, Tiananmen Square in Beijing was the site of
China’s main industries.
China’s government headquarters.
pro-democracy demonstrations.
anti-democracy demonstrations.

The Tienanmen Square in Beijing was the site of

pro-democracy demonstrations.

Explanation:

The pro democracy protests of the Tienanmen square were on their heights at the point of time in 89.

This was to be crushed  by the Chinese government terribly and with brute force and use of military might and since then there have rarely been such protests to happen in that nation.

The massacre of the people at the square has been documented by the outside sources but the government has claimed that they never happened

the answer would be a i think?

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;