Corrections · 4
the big issue here is not grammar - you really have to be more careful when you write; read it over and see if it makes sense, make sure every 'they' and 'this' and 'that' clearly refers to something because this is the biggest problem.
Nuclear weapons have been invented around/in use since the World War II [1]. Many countries believe [2] that such weapons can keep the world in at peace. But whether they [who? weapons or countries?] are global peacemakers or killing devices is a notion/question that must be considered.
Since the WWII, [3] many countries have developed their nuclear weapons. The US used them nuclear weapons to bomb Nangasaki Nagasaki and Hiroshima which put the war to an end [sounds like 'Nagasaki and Hiroshima put the war to an end]. When used (in) this way, we might can say that nuclear weapons are the global peacekeepers. Since then, [since when?] many countries have been afraid of each other one another. Consequently, the world becomes even more integrated. Each country tries to form a relationship or an ally alliance with one another the other in case another war might happens again. They [who?] are scared of everything anything which they are going to do might have to do because they believe that the future wars is are going to be fought with nuclear weapons. Only one of these [which kind?] bombs can destroy the a small country like Thailand. Imagine countries like America and Russia, they own many of these [which kind?] weapons; they can surely destroy the whole world. Accordingly, the world still remains in peace and stability. But in on the other hand, it can be said that people are just frightened of the results aftermath of the nuclear weapons, so they would rather stay quiet.
Even though, nuclear weapons are great at keeping the world in at peace, they are still killing devices. If the world had another great war, it would destroy the world and leave it into pieces with nothing left else/more remaining. They [who?] can kill thousands or billions of people in a the blink of an eye. They [who/what?] are also taken take time to make be made because they need require advanced technologies and a great amount of money. This means that not all the countries have them [what?]. According to this [according to what?], the ones who [which ones?] own the deadly weapons can take advantage from of the others, who do not own weapons. For instant instance, they [who?] might scare the countries that do not have nuclear bombs so that they [who?] could get benefits for their [whose?] self-interest.
So, when considering whether nuclear weapons are peacemakers or killing devices we/one must take many things into account. Such weapons might be able to remain keep the world in at peace but they are also the threats many countries use used by many countries to frighten each other one another.
[1]x was invented on/before/during - not 'since'
[2] countries are inanimate; people in countries can believe
[3] there is never an article before 'World War II'
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