<Tr> <Td> Nepal </Td> <Td> Asia </Td> <Td> 000000001768 - 01 - 01 - 0000 1768 </Td> <Td> 000000001768 - 01 - 01 - 0000 1768 </Td> <Td> (none) </Td> <Td> Autonomous throughout its recorded history, and certainly since its 1768 unification . The ancient Maurya Empire occupied southern Nepal, but not the core Kathmandu valley . </Td> </Tr> <Tr> <Td> Netherlands </Td> <Td> Europe </Td> <Td> 000000001581 - 07 - 26 - 0000 Jul 26, 1581 </Td> <Td> 000000001945 - 01 - 01 - 0000 1945 </Td> <Td> Spain </Td> <Td> Independent from Spain in 1581; occupied by France under Napoleon . </Td> </Tr> <Tr> <Td> New Zealand </Td> <Td> Oceania </Td> <Td> 000000001907 - 09 - 25 - 0000 Sep 25, 1907 </Td> <Td> 000000001947 - 11 - 25 - 0000 Nov 25, 1947 </Td> <Td> United Kingdom </Td> <Td> Dominion status 1907, Statute of Westminster Adoption Act 1947 . Maori tribesmen (iwi) </Td> </Tr> <Tr> <Td> Nicaragua </Td> <Td> The Americas </Td> <Td> 000000001821 - 09 - 15 - 0000 Sep 15, 1821 </Td> <Td> 000000001821 - 09 - 15 - 0000 Sep 15, 1821 </Td> <Td> Federal Republic of Central America </Td> <Td> Previously a part of the Greater Republic of Central America 1896--98, the Federal Republic of Central America 1823--38, Mexico 1822--23, and a colony of Spain before 1821 . </Td> </Tr>

When did the us become a sovereign nation