<Tr> <Td> Al Said (Oman) </Td> <Td> 1749--present </Td> </Tr> <Tr> <Td> Al Sabah (Kuwait) </Td> <Td> 1752--present </Td> </Tr> <Tr> <Td> Al Nahyan (Abu Dhabi) </Td> <Td> 1761--present </Td> </Tr> <Tr> <Td> Al Nuaim (Ajman) </Td> <Td> 1810--present </Td> </Tr>

Why did the 2nd caliph need to expand the area around the kaaba