The USA has been accused of starting wars by false flag operations since the Maine.
Some USA agencies linked to the CIA have admitted using covert means to start wars such us The Washington Institute for Near East Policy. This is an American think tank who is researching some programs all based on the middle east. This think tank have some former government officers including R.James Woolsey Jr former CIA director.
Years ago Dr. Patrick Clawson director of research said in a press conference:
I frankly think crisis initiation is really tough, and it's hard for me to see how the United States President can get us to war with Iran...
Later he talks about many questionable American wars that could have started by false flag operations.
...we are in the game of using covert means against the Iranians...
This man also appears on the BBC and many other talk shows.
Knowing that the USA spends more money on the military than the next 9 countries of the list combined (ref here) and 9/11 is being investigated by as a possible false flag operation. (ref here) and here. And the CIA has done many controversial operations installing and removing leaders all over the world.
Would it be possible to start sanctions against the USA or even ban them from the United Nations?