Explanation:
Mongol expansion causes turkish migration into Anatolia (The region of Turkey)
The migration causes the collapse of the Byzantine Empire to the Ottomans
The Kingdoms of Castille and Portugal find new trade routes to avoid trading with the Ottomans
They find the Americas
7 years war starts from the Anglo-French colonial rivalry in North America
Britain taxes colonies because of financial trouble after the war
French finance American revolution
France has major economic troubles from this, causing the French Revolution
French Revolutionary and Napoleonic Wars
Napoleon spreads his revolutionary ideas across Europe
The ideas cause the unifications of Germany and Italy, and the nationalist movements in the balkans
Decline of the Ottomans and Balkan Independence
Austria-Hungary occupies, and later annexes Bosnia
Franz Ferdinand is assassinated
Germany gives unconditional support to AH
World War One
The war causes the Russian Revolution, and later civil war
Communists form the USSR
Germany starts WWII
The war causes the USA and USSR to become global superpowers
Cold war
The USSR collapses