<Tr> <Th> </Th> <Th_colspan="3"> Employment% </Th> <Th_colspan="3"> Output% (1860 prices) </Th> </Tr> <Tr> <Td> Year </Td> <Td> Agriculture </Td> <Td> Industry </Td> <Td> Services </Td> <Td> Agriculture </Td> <Td> Industry </Td> <Td> Services </Td> </Tr> <Tr> <Td> 1840 </Td> <Td> 68 </Td> <Td> 12 </Td> <Td> 20 </Td> <Td> 47 </Td> <Td> 21 </Td> <Td> 31 </Td> </Tr> <Tr> <Td> 1850 </Td> <Td> 60 </Td> <Td> 17 </Td> <Td> 23 </Td> <Td> 42 </Td> <Td> 29 </Td> <Td> 29 </Td> </Tr>

What are the liabilities of the united states that made it difficult to build a nation