Answer:
On 20 June 1789, the members of the French Third Estate took the Tennis Court Oath (French: Serment du Jeu de Paume), vowing "not to separate and to reassemble wherever necessary, until the Constitution of the kingdom is established". It was a pivotal event in the French Revolution.
Explanation:
Well assuming you mean America, and not considering Civil War, I would say the draft of the Constitution Thomas Jefferson want to make slavery illegal, but he needed the southern states approval.
The telegram was considered perhaps Britain's greatest intelligence coup of World War I and, coupled with American outrage over Germany's resumption of unrestricted submarine warfare, was the tipping point persuading the U.S. to join the war
I would say the 14th amendment because it gave equal rights and protections under the law.
