is the Indian (Bharatiya) concept of Nation ?! Did the Brits give us that ?
Well, not a scholarly attempt, but these verses should give some clue...
Case 1 :-)
vis'va_mitrasya raks.ati brahmedam bha_ratam janam
Atharva Veda 19.41.1 (Note, the transliteration of the shloka may have errors)
"BHADRAM ICHCHANTA RISHAYAH SWARVIDAH
TAPO DEEKSHAM UPANISHEDUH AGRE
TATO RASHTRAM BALAM OJASHSCHA JATAM
TADASMAI DEVAH UPASANNAMANTU ."
Translatin: The sages, aspiring for a higher and better standard,work with diligence and devotion; They inspire people to do their duty with dedication. This is the way how Nations and communities grow strong.