Build a giant ice wall guarded by prisoners around the US.

The best way to invest in the future! The length of the outer boundary of the USA is nearly 40.000 kilometers so we would need 40.000.000 1x1x1 ice blocks for one row. I would say the wall should be 60 x 120 blocks large so we need 288.000.000.000 ice blocks. 2014, 318,857,056 people lived in the US (http://quickfacts.census.gov/qfd/states/00000.html) so everyone would need to produce 903 ice blocks which sounds like a good deal, especially because it's about the defense of the country. So how do we build that giant wall? With prisoners and workers paid with a plot near that majestic building! The prisoners are also the people who will guard the wall when it's ready. And don't fear that the wall could melt. That's impossible because winter is coming!