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.
This list assumes you are playing the Vanilla version of Minecraft, with no mods installed. Tools Which is to say, a pickaxe first. Your Iron pickaxe will be your friend deep underground, when you find a rare ore to mine such as gold or, dare I say, diamond. BUT, you generally only need one pickaxe made of iron for those rare ores, especially when you have a low number of ingots. An iron sword is also a major improvement over the stone sword, and if you find yourself troubled by monsters frequently, it could be a worthwhile investment. Don't waste the iron on axes, hoes, or shovels though.