Just as the total population of illegal immigrants in the U.S. has declined since 2007, the proportion of illegal immigrants in the workforce has also declined; in 2012, illegal immigrants made up 5.1% of the U.S.'s civilian labor force.
Iron Ore is a common ore found almost everywhere in a Minecraft World. Iron ore generates around and below sea-level in the Overworld. It is a crucial material to gather during the early stages of the game, since it can be made into an iron pickaxe capable of mining all types of ores (including diamond). Every Iron Ore block contains enough iron to make one Iron Ingot, when it is smelted.
1 The third type created must be an iron pickaxe, but either diamond or gold pickaxes can be made after this. This order is made assuming the player does not find or trade for any pickaxes.  There is a rare glitch where, when a pickaxe breaks, it will instantly re-appear in your inventory.