US Policies and Actions; What would you have done differently?

Just throwing a few out there. Feel free to add some in.

For example, if you could turn back the clock and knowing what you know now, would you (if you were president) have invaded Iraq? Afghanistan?

Iraq situation
Hiroshima (Dropped the bomb?)

Vietnam escalation (Would you have let it escalate?) Note: China and Vietnam are “state capitalist” and not communist anymore. Too bad that no one in the US government in the ‘60s foresaw that communism would disappear from Vietnam over 30 years into the future and would be dismantled by the Vietnamese themselves. Just think of how many lives would have been saved if someone could have foreseen the future…

Build the International space station?
Boycott 1980 Olympics?
Let MacArthur go into North Korea?
(Californians), supported Prop 13?
Elect a president via electoral college (assuming it wasn’t always done this way)?
Supported the creation of Israel?
Got involved in WWI?

Are there other policies and actions you would like to mention? Something like “We should have never…..”, OR “We should have…..”???