Eastern-Western Zhou Split / 东周西周分裂

Eastern-Western Zhou split / 东周西周分裂 is the political-fragmentation frame 《资治通鉴·周纪》16丨孙膑庞涓恩怨纠葛 桂陵之战 uses to explain why 韩国 can attack “东周” in 353 BCE. The episode says the 周王室 has already shrunk to a very small domain and then split internally into 东周国 and 西周国.

The concept keeps terminology clean. “Eastern Zhou” can name a long historical era, but in this source the phrase points to one of two small Zhou polities around the old royal center. That distinction matters because the episode’s broader claim is about royal-house decline inside the 战国时期, not about a dynasty-wide war.

Key Claims

• Zhou royal chronology can remain important even after royal territorial control becomes small.
• Internal division makes the royal house vulnerable to neighboring states such as Han.
• The source treats East/West Zhou as evidence of political contraction, not as a new great-power bloc.
• Clear naming prevents confusion between a period label and a polity label.

Connections

• 周王室, 东周国, and 西周国 - main political branch.
• 韩国 - attacker in the 353 BCE notice.
• 周显王 and 《资治通鉴》 - annalistic frame.
• 战国时期 and Early Warring States Interstate War / 战国早期诸侯混战 - broader setting.