<Tr> <Th> Wyoming </Th> <Td>? </Td> <Td> 21 </Td> <Td> 1973: Lowered to 19 </Td> <Td> 1988: Raised to 21 in 1988 (Jul 1) Last state to raise de jure drinking age to 21 </Td> <Td> 21 </Td> </Tr> <Tr> <Th> American Samoa </Th> <Td>? </Td> <Td>? </Td> <Td>? </Td> <Td> 21? </Td> <Td> 21 </Td> </Tr> <Tr> <Th> Northern Mariana Islands </Th> <Td>--</Td> <Td>--</Td> <Td>? </Td> <Td> 21? </Td> <Td> 21 </Td> </Tr> <Tr> <Th> Puerto Rico </Th> <Td>? </Td> <Td> 18 </Td> <Td> 18 </Td> <Td> Kept at 18 despite 10% highway funding penalty under Drinking Age Act . </Td> <Td> 18 </Td> </Tr>

When did the drinking age become 21 in indiana