The Legislature shall by law determine the number of members to be elected and divide the state into legislative districts. In the creation of such districts, any county that contains population sufficient to entitle it to two or more members of the Legislature shall be divided into separate and distinct legislative districts, as nearly equal in population as may be and composed of contiguous and compact territory. One member of the Legislature shall be elected from each such district. The basis of apportionment shall be the population excluding aliens, as shown by the next preceding federal census. The Legislature shall redistrict the state after each federal decennial census. In any such redistricting, county lines shall be followed whenever practicable, but other established lines may be followed at the discretion of the Legislature.