Ancient Greek civilization - Theban Expansion, City-States, Polis
https://www.britannica.com/place/ancient-Greece/Theban-expansion
WEBTheban expansionism was bound to drive Athens and Sparta together before long. Despite renewed fighting between Athens and Sparta in the west (374 and 373) and despite Thebes’s continued, though increasingly reluctant, contributions to the Athenian navy (373), it was becoming clear that Thebes was the real threat to both Athens and Sparta.
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