This day is known as The Battle of Dien Bin Phu, where the Viet Minh forces won over the French. The Geneva Accords were signed later as a result of this and the correct answer is:
The Vietminh laid <span>siege to a garrison of French troops who then surrendered. </span>
The Dred Scott decision, or lawsuit as you put it, was a case where it was stated by the court that people of African descent could not be American citizens and had no standing in court. They, whether free or not, had no power to regulate slavery in the United States. His rights have been violated for many reasons. He was accused of standing in court for just being black. It was very unconstitutional and found by many historians as one of the worst Supreme Court decisions ever made.
A historian using the historical thinking skill of chronological thinking might put evens that took place in history in "chronological order" in the hopes of understanding why certain events took place after others. This helps the historian determine "cause and effect".
