Simple. One country might have some materials, goods, etc., that is vital for another country. These countries trade so that they are able to access the resources that other nations provide.
The Major province of the Gulf of Tonkin resolution was to empower President Johnson to take any necessary steps, which were required to bring security and peace in the South East Asia, not only nationally, but also internationally. The resolution was passed by the Congress in 1964.
Answer: extinction
Explanation: it happens when a species completly dies out and there are no more