Nearly 40 countries ended aboveground nuclear tests.
This is a bit subjective, but it could be argued that social change had the biggest change in Southern life, since the abolition os slavery (which was inherently a social issue) led to the biggest changes.
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Great Britain entered World War I on 4 August 1914 when the king declared war after the expiration of an ultimatum to Germany. The official explanation focused on protecting Belgian neutrality; the main reason, however, was to prevent a French defeat that would have left Germany in control of Western Europe.
hope this helps , have a good day , peace
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