How was the estates-general useful in uniting france under one national identity

It was useful because it gave the French people and the nation of France a common ground and common cause for which they were able to fight together. the newly felt sense of unity was something they hadn't experienced before and enabled them to achieve glory in their young country.

It gave France and its people common ground and a common cause tat they were able to fight together. This gave them something they had never felt before, a sense of unity, which helped them achieve all sorts of glory and honor in their juvenile country.