The Truman Doctrine established that the US would provide support to other countries under threat from Communism by the Soviets. This also resulted in the Korean War 3 years later.
This citizenship is called a dual citizenship because let's say for example Mexico and America, that person would have citizenship to America AND Mexico.
I hope this helps you! :)
If you mean Prince Henry the navigator, he was the third son of King John I from Portugal and he was called infante Dom Henrique in Portuguese.
The American revolution caused bankruptcy in France, and led to the revolt of the third estate
