Answer:
La Guerra Fría comenzó después de la rendición de la Alemania nazi en 1945, cuando la incómoda alianza entre Estados Unidos y Gran Bretaña por un lado y la Unión Soviética por el otro comenzó a desmoronarse. ... Los estadounidenses y los británicos estaban preocupados de que la dominación soviética en Europa del Este pudiera ser permanente.
Explanation:
Analyzing and breaking coded messages
electronic surveillance
analyzing data from spy satellites
But I mean your security so it could be multiple things
The reason people immigrate from one country to another is because they might have natural disasters or land and a occupation is hard to find there. So people might just be migrating to find happiness or a better life than what they had.
They were concerned that getting the government involved would hurt states' rights.
International? You really don't give much information but I believe that's it.