I am assuming you are talking about the US. So in the North they have Rocky Poor Soil.
A. Modernism is the answer
The Strategic Arms Reduction Treaty (START) number one was designed to
reduce the number of nuclear weapons. It was signed July 31, 1991 and went into full force by 1994. Eventually it was to control and remove warheads and nuclear weapons. Start 1 achieved an 80% removal which was considered to be a success. Other treaties followed.
According to a catastrophic new assessment from the World Bank, projected sea level rise would cause 40 percent of the structures in the Marshall Islands' capital of Majuro to be permanently submerged and entire islands to vanish, potentially costing the Pacific republic its identity as a nation.