[caldrail]

good mornings folks, the reason why so many similar planes all around the world popped up is, because of germany lost the war and so many designers and mechanics were locked up in secret areas of the United States, United Kingdom and the former Soviet Union, were they had to work on projected planes like the Ta 183 and other secret planes.

That had little to do with it. What we see in this phenomenon is a roughly comparable level of aerodynamic understanding. In other words, the same solutions to problems or means to exploit technical advances were being made seperately. Remember that aircraft design in World War Two (or indeed, any other period before the sixties) was competitive, not co-operative. That said the research conducted by Germany did influence aircraft design in the post-1945 era, but bear in mind that although Germany had made some real advances in scientific thinking, they weren't as far ahead of the allies as is commonly believed.