This chapter designs to insure the state against any actual or potential threat to its territorial extent or established areas of interest. An examination of policies for the defence of the state suggests that the most meaningful division separates unilateral and multilateral policies. All the policies for the defence of the state are likely to have one or both of two primary aims-to make the state and its allies stronger, and to make the opponents of the state weaker. Policy decisions to strengthen the state usually aim at an improvement in the state's intrinsic power, or the acquisition of allies. Policies to weaken a hostile state usually centre on attempts to increase their problems, truncate their military and economic bases, and deny them the assistance of allies. In case of a colony transferred political geographers search, together with economic and settlement geographers, for a change in political authority brings changes in landscape and economic development in train.