On the Palestinians and Israelis ... isn't the world fed-up with these two peoples ?

I surely am.   However, on the issue of  the US Embassy being moved to Jerusalem thus giving USA's confirmation that Jerusalem belongs to the Jews, I concur.  Jews were there in Jerusalem long before anybody else.
Christians were the followers of Christ who rebelled against his Jewish brethren and set up his own ... call it a religious group or a political party or what you will... it's your choice.  Much later came the Mohammedans (was it 4 centuries later, more?) as the followers of Mohammad were known then.   So, yes .... by all rights and reason ... Jerusalem belongs to the Jews.  Hopefully, they will find it fit to keep it available to all three religions unless they want a shitload of trouble.