I believe it is the same as saying "doctor, first heal thyself." in other words, if you want to change the world for the better, first start with changing your own country for the better. Look internally and fix that before moving to the external.
That was Truman.
In order to get help defending themselves, or in order to put pressure on another nation in world politics.
Haiti is not the first capital in the world, but it is the first black nation in the world
A "have nation" describes a developed, first world country, that have all the latest technologies of the world. A "have not nation" describes a still developing nation that is behind on technology and is less advanced than the first world countries.
it is in yourtext
The first nuclear bombs were developed in the United States of America during the Second World War in 1939 under the order of President Franklin Roosevelt.
SPAIN.
Uruguay
Uruguay
Uruguay.
Portugal
Liberia