Fallout shelters, many of which would be totally inadequate to protect and sustain their occupants for the required time they might have had to remain there.
After WW2, as the cold war built up, many people built fallout shelters. They were good for other things besides nuclear war, ranging from a tornado shelter to a wine cellar.
Many people built fallout shelters at their homes, and took classes to learn about radiation.
Many Americans practiced duck-and-cover drills during the Cold War to prepare for a potential nuclear attack. These drills involved taking cover under desks or in designated safe areas to protect against the blast and fallout. Schools and communities often conducted these exercises to familiarize citizens, especially children, with emergency procedures. Additionally, some families built fallout shelters in their homes as a precautionary measure.
The last nuclear reactor has not been built yet.
Nuclear reactors are built. Therefore the source is the country that commissioned and built them.
Well, to my research there hasn't been any nuclear bombs, Aussie has built.
The first commercial nuclear power plant in the US was built in 1957 in Shippingport, Pennsylvania. The first commercial nuclear power plant in the world was built in 1956 in Calder Hill, UK.
If enough nuclear plants are built, yes
Producing weaponized uranium and nuclear material from which nuclear bombs can be built.
1945
Presidios were built to protect the Spanish settlements from attack.
Nope. That was the reasons that castles were built- to be hard to attack.