What would It take for a leader to truly unite the world and help solve many of its issues? Why?

Intelligence, diplomacy and an understanding of humanity. That's a lot to ask from one person.

In the 80's Reagan and Thatcher ran the world. When the U.S. polices the world and has a strong President, you don't have cockroaches like ISIS, the Taliban, Al Quada, Boka Haram and all the other terrorist gangs running around. This worldwide unrest only happens when you have a weak, America hating, Muslim supporter in the office. Obama has done all this on purpose, so WWIII can break out. He's despicable!

Invaders from the outside. Humans instinctively live in bands and group bands together to compete with other groups of bands. This means local wars are a part of human nature. Local wars tend to grow to regional and regional tend to grow to world conflicts.

So WW-3 was called the Cold War that was not cold depending on where you lived. And now we are in the beginning stages of WW-4 as Jihadists enter their historical crusade phase.

One leader cannot unite everyone. It's up to the other countries to be united together also.

Aliens to unite humanity against an em

Nemey

Decent afternoon tea. When the leaders don't sit down and talk over a decent afternoon tea, that's what happens.

Magic

A good and quality adhesive to fix. Quick-fix is the best.

not a human never seen one yet remotely capable they go insane