What barred nuclear testing in the atmosphere?

limited test ban treaty
berlin wall
nato
warsaw pact

The correct answer is the nuclear test ban treaty it was signed by the U.S. U.K. and U.S.S.R. in 1963 prohibiting any underwater in the atmosphere or jn outer space tests of nuclear weapons however underground tests were still ok as long as the debris stayed inside the countries boarders

Muslim armies began attacking the Empire in 700, while Turk armies captured Constantinople in 1453.