It is Document A that is the reliable source.
Answer:
1. They did not have asses of weapon
2. They did not have enough support since their fellow countries in which they cooperate with were defeated
3. At the war progress they were not economically strong.
Answer: The scholars immediately disagreed over the causes of the war and disagreement persists today. Many maintain that the primary cause of the war was the Southern states' desire to preserve the institution of slavery. Others minimize slavery and point to other factors, such as taxation or the principle of States' Rights.
Viking expansion is the process by which Norse explorers, traders and warriors, the latter known in modern scholarship as Vikings, sailed most of the North Atlantic, reaching south to North Africa and east to Russia, Constantinople and the Middle East as looters, traders, colonists and mercenaries. Vikings under Leif Erikson, the heir to Erik the Red, reached North America and set up a short-lived settlement in present-day L'Anse aux Meadows, Newfoundland, Canada. Longer lasting and more established settlements were formed in Greenland, Iceland, the Faroe Islands, Great Britain, Ireland and Normandy.