Most Important What If by Decade

I'm creating this thread to identify the most significant what-if moments globally by century. These could be things that happened or were prevented (e.g. assassination attempt whether it suceeded or failed) and can be simple PODs or huge huge events. Please copy and fill out the following, you don't have to fill out it all just as many as you wish, including if you want to add earlier centuries.

10th century BC (1000 BC-901 BC):
9th century BC (900 BC-801 BC):
8th century BC (800 BC-701 BC):
7th century BC (700 BC-601 BC):
6th century BC (600 BC-501 BC):
5th century BC (500 BC-401 BC):
4th century BC (400 BC-301 BC):
3rd century BC (300 BC-201 BC):
2nd century BC (200 BC-101 BC):
1st century BC (100 BC-1 BC):
1st century (AD 1-AD 100):
2nd century (AD 101-AD 200):
3rd century (AD 201-AD 300):
4th century (AD 301-AD 400):
5th century (AD 401-AD 500):
6th century (AD 501-AD 600):
7th century (AD 601-AD 700):
8th century (AD 701-AD 800):
9th century (AD 801-AD 900):
10th century (AD 901-AD 1000):
11th century (AD 1001-AD 1100):
12th century (AD 1101-AD 1200):
13th century (AD 1201-AD 1300):
14th century (AD 1301-AD 1400):
15th century (AD 1401-AD 1500):
16th century (AD 1501-AD 1600):
17th century (AD 1601-AD 1700):
18th century (AD 1701-AD 1800):
19th century (AD 1801-AD 1900):

I'm starting a separate thread for 1900 onward done by decade, I'll post a link in this once its created, and maybe I'll do polls for each century to vote for what they think is the most important POD by century.

Here's an example by me:
10th century BC (1000 BC-901 BC): Conquests of King Adad-nirari of Assyria, paving the way for the Neo-Assyrian Empire.
9th century BC (900 BC-801 BC): Foundation of Carthage.
8th century BC (800 BC-701 BC): The Assyrian siege of Jerusalem, Judaism survives
7th century BC (700 BC-601 BC): Sack of Ninevah, allowing the rise of the Neo-Babylonian Empire and the Medes
6th century BC (600 BC-501 BC): Conquests of Cyrus the Great
5th century BC (500 BC-401 BC): Foundation of Buddhism
4th century BC (400 BC-301 BC): Alexander the Great survives the battle of Grancus
3rd century BC (300 BC-201 BC): Qin Shi Huang united China
2nd century BC (200 BC-101 BC): Seleucid Empire collapses
1st century BC (100 BC-1 BC): Octavian becomes the first Roman Empire
1st century (AD 1-AD 100): St Paul spreads Christianity
2nd century (AD 101-AD 200): Jews forced into exile
3rd century (AD 201-AD 300): Fall of the Han Dynasty
4th century (AD 301-AD 400): Battle of Adrianople
5th century (AD 401-AD 500): Battle of Nadao
6th century (AD 501-AD 600): Expansion of the Byzantine Empire under Justinian
7th century (AD 601-AD 700): Spread of Islam
8th century (AD 701-AD 800): Arab advance halted at Constantinople in 718
9th century (AD 801-AD 900): The Magyars arrive in Pannonia
10th century (AD 901-AD 1000): Vladimir the Great of Kiev converts to Orthodox Christianity
11th century (AD 1001-AD 1100): William the Conqueror becomes king of England
12th century (AD 1101-AD 1200): Battle of Hattin
13th century (AD 1201-AD 1300): Rise of the Mongol Empire
14th century (AD 1301-AD 1400): The Black Death
15th century (AD 1401-AD 1500): Invention of the printing press
16th century (AD 1501-AD 1600): Conquests of Akbar the Great in India
17th century (AD 1601-AD 1700): Isaac Newton publishes The Principia in 1687
18th century (AD 1701-AD 1800): The French Revolution
19th century (AD 1801-AD 1900): German victory in the Franco-Prussian War.
 
10th century BC (1000 BC-901 BC): Iron
9th century BC (900 BC-801 BC): Foundation of Carthage.
8th century BC (800 BC-701 BC): Greek colonisation
7th century BC (700 BC-601 BC): Baudhayana
6th century BC (600 BC-501 BC): Persian Empire
5th century BC (500 BC-401 BC): Persian Wars
4th century BC (400 BC-301 BC): Spread of idealist philosophy (Budhism, Socrat, Druidism, etc.)
3rd century BC (300 BC-201 BC): Qin Shi Huang united China
2nd century BC (200 BC-101 BC): Rome in Orient.
1st century BC (100 BC-1 BC): Roman Empire
1st century (AD 1-AD 100): Teutoburg
2nd century (AD 101-AD 200): Christianity distinct from Judaism
3rd century (AD 201-AD 300): Han falling
4th century (AD 301-AD 400): Battle of Adrianople
5th century (AD 401-AD 500): St Augustine
6th century (AD 501-AD 600) :Formation of germano-roman kingdoms
7th century (AD 601-AD 700) : Islam
8th century (AD 701-AD 800): Conquest of west by Arabo-Muslims (Africa and Spain)
9th century (AD 801-AD 900): Feudalism
10th century (AD 901-AD 1000): Slavs form states
11th century (AD 1001-AD 1100): Begining of the Reconquista
12th century (AD 1101-AD 1200) : 12th "Renaissance"
13th century (AD 1201-AD 1300):Gengihs Khan
14th century (AD 1301-AD 1400): Decline of feudality
15th century (AD 1401-AD 1500):End of HYW
16th century (AD 1501-AD 1600):Conquest of Aztec Empire
17th century (AD 1601-AD 1700):Louis XIV and Grand Siècle
18th century (AD 1701-AD 1800):French Revolution
19th century (AD 1801-AD 1900): Rise of nationalisms.
 
Taken from my biggest TL ideas by century:

7th century BC (700 BC-601 BC): Fall of the Neo-Assyrian Empire
6th century BC (600 BC-501 BC): [don't know]
5th century BC (500 BC-401 BC): Sicilian Expedition
4th century BC (400 BC-301 BC): Socrates Executed / Alexander the Great destroys Persian Empire
3rd century BC (300 BC-201 BC): Jing Ke survives assassination (becomes Shih Huang Ti)
2nd century BC (200 BC-101 BC): Hannibal fails to consolidate defeat of Rome
1st century BC (100 BC-1 BC): Battle of Pharsalus
1st century (AD 1-AD 100): Tiberius becomes Augustus' heir / Pontius Pilate executes Jesus
2nd century (AD 101-AD 200): [don't know]
3rd century (AD 201-AD 300): Battle of Red Cliffs
4th century (AD 301-AD 400): [don't know]
5th century (AD 401-AD 500): Fall of the Western Roman Empire
6th century (AD 501-AD 600): Year of the Elephant
7th century (AD 601-AD 700): (see above)
8th century (AD 701-AD 800): [don't know]
9th century (AD 801-AD 900): Louis the Pious dividing Charlemagne's Empire
10th century (AD 901-AD 1000): Decline of the Caliphate of Cordoba
11th century (AD 1001-AD 1100): Battle of Hastings / Battle of Manzikert
12th century (AD 1101-AD 1200): [don't know]
13th century (AD 1201-AD 1300): Temujin becoming Genghis Khan (not dying beforehand)
14th century (AD 1301-AD 1400): [don't know]
15th century (AD 1401-AD 1500): Columbus' First Voyage
16th century (AD 1501-AD 1600): Death of Oda Nobunaga
17th century (AD 1601-AD 1700): Rise of Aurangzeb
18th century (AD 1701-AD 1800): Battle of Saratoga

And for the 19th Century:

1800's (1801-10): French Haitian Expedition
1810's (1811-20): Declaration of the War of 1812
1820's (1821-30): Corrupt Bargain of 1824
1830's (1831-40): East India Co. loss of the opium trade monopoly (led to Opium War)
1840's (1841-50): [don't know]
1850's (1851-60): Darwin publishes Origin of the Species
1860's (1861-70): Thwarted Maryland Campaign or the assassination of Lincoln
1870's (1871-80): [don't know]
1880's (1881-90): Berlin Conference
1890's (1891-1900): [don't know]
 
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