Imagine unwrapping a loaf of bread and having to search for the bread knife, then slicing the loaf before making your morning toast. The loaves were marketed as Kleen Maid Sliced Bread. The popularity of sliced bread spread quickly, with Wonder Bread first being sold in sliced loaves in 1930. During World War II, the government sought to ban sliced bread in order to conserve the steel used to build the slicing machines. Sliced bread became such a pivotal point in American inventions that it has now become something to which other inventions are compared--“the best thing since sliced bread.”