Which US president led the charge with the “Just Say No” anti-drug program?

President Ronald Reagan

Explanation:

In a nationally broadcast message to the American people on September 14, 1986, first lady Nancy Reagan joins President Ronald Reagan to kick off her "Just Say No" campaign, an effort to raise drug abuse awareness.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.