yes a clash of civiztns/ nations is inevitable, if not the world changes drastically or turn upside down.
All nations are preparing their best secretly and also publicize some of their "developments for defense", as they say.
All are creating power for the war ahead that they may survive or win or not be wiped out. Its almost like inevitable as all are doing this even though the UN is trying to promote world peace.
the winner cannot be told, usa may be strongest 1v1, but its fact that nations will also form an alliance.
einstein also say that WW4 will be fought using sticks and stones