I can do it REALLY simple.
Trump thinks he's the man. He announces Jerusalem to be Israel's capital. Israel goes 'Wooo' and Jerusalem goes 'WTF MAN?!' and a lot of smaller factions goes, 'WTF, US!?'. Trump believes he did something good but just made everything worse. And now the UN is like, 'Trump, dude, you can't do that kind of shit, man', The end.