<Tr> <Td> Progressive Era </Td> <Td> 1897--1920 </Td> </Tr> <Tr> <Td> Roaring Twenties </Td> <Td> 1920--1929 </Td> </Tr> <Tr> <Td> Great Depression </Td> <Td> 1929--1939 </Td> </Tr> <Tr> <Td> World War II </Td> <Td> 1941--1945 </Td> </Tr>

What were the primary uses of steel during the gilded age