Answer:
I think it was the crusades.
Your answer is B: A Bill of Rights and an announcement they would establish a republic based upon hope this helps :D
The Vietnam War was a highly contentious period of time for the US, as it divided the nation in two and raised a counter culture that fought against government intervention. Many believed that the United States had no business in this conflict.
I believe it is D) It suffered a weakening economy, domestic revolts, and a loss to the Allies in World War I.