World War 1 never happens

The beginning of World War 1 had started because of many reasons other than that of the Assassination of Archduke Ferdinand which is usually what people chalk it up too. So for this Alternate Timeline Scenario let's say absolutely no matter what the events that led to the First World War never happen, or at least don't turn into World War 1. What would change, how different would modern-day look if we didn't have World War 1.

Without WW1 there is no WW2.

Our Timeline	Alt-Timeline
German Empire falls, Germany falls into a Great Depression due to the Treaty of Versailles.	German Empire becomes an economic powerhouse.
On February 24, 1920, a wounded ww1 veteran called Adolf Hitler formed The National Socialist German Workers' Party.	Hitler never forms The National Socialist German Workers' Party.
Hitler appointed Chancellor of Germany in 1933	Hitler never becomes the leader of Germany
Poland is invaded by Germany, WW2 begins.	There is never an invasion of Poland and the Holocaust never happens.
85 million people die during WW2, Veterans return home and cause massive growth in birthrates aka Baby Boomers.	Without WW2, Baby Boomers wouldn't exist potentially causing a smaller population in modern day.

Without WW1 there's no Cold War between the US and Soviets.

Our TImeline	Alt-Timeline
Russian Empire enters war to preserve its Great Power status.	Russian Empire never joins a war.
Russia suffers from a number of economic and social problems.	Russian Empire doesn't economically suffer from the war.
Russian citizens protest and multiple protest occur, Including February Revolution and October Revolution.	There are never any protest or at least not as massive as they were.
Russian Empire falls as Nicholas II is forced to renounce leadership.	Nicholas II never renounces his throne.
Russian Soviet Federative Socialist Republic is formed and the the Russian Civil War begins.	There is never a civil war between Soviets and White Movement.
Soviets win Civil War causing the rise of the Soviet Union.	The Soviet Union never win a war and rise to power.
In World War 2, America develops the Nuclear Bomb.	Without World War 1 or 2, there is never a reason to develop a Nuclear Weapon.
After World War 2, Soviet Union acquires it's own Bomb and tensions rise between The Soviets and the West.	Tensions never rise between Russians and West, at least not for the same reasons.
America and Russia have multiple competitions to prove who is superior. Including the Arms Race and the Space Race.	There is never a Arms Race because there are no Nuclear Weapons and there is never any missions to Space.