What famous
treaty was signed on this day in 1957 by six
European nations, and what impact did this
treaty have on Europe and the world?

France, West Germany, Italy, the Netherlands, Belgium and Luxembourg signed the Treaty establishing the European Economic Community (TEEC) - more commonly known as the Treaty of Rome - which would bring the EEC into operation in January the following year.

Explanation:

The Treaty of Rome was signed in 1957 by the six European countries of Belgium, Netherlands, Luxembourg, Germany, France, and Italy and It had A big impact because of course any working treaty has a big impact but the Treaty of Rome stop many wars between Belgium, Netherlands, Luxembourg, Germany, France, and Italy.Plus helped many trades between those countries.

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i think the answer is d. good luck.