Where will our staple foods come from?

Where will our staple foods come from?: "It seems like discussions of gardening are often focused on growing fruits and vegetables. The question that comes to me is, 'What do we do about staple carbohydrate foods?' like wheat or corn (maize) or potatoes. These foods are ones that store well, and supply a large portion of the calories of the diets of most people around the world. In the US, wheat has tended to be a staple, but it is not easy for a home gardener to grow, and it requires processing that is more easily done by commercial equipment. So the question I have is, 'How should we plan to get our staple carbohydrate foods going forward?'"