If the customer has an outstanding margin loan against the securities of $50,000, his equity will be $10,000 ($60,000 - $50,000 = $10,000). The broker determines the customer should receive a margin call for $5,000 ($15,000 - $10,000 = $5,000).
War Powers. Congress holds the power to declare war. As a result, the president cannot declare war without their approval. However, as the Commander in Chief of the armed forces, many presidents have sent troops to battle without an official war declaration (ex. Vietnam, Korea).
First off, Lincoln did not declare war. In the Constitution, only the Congress can make war. Although President Abraham Lincoln nor the Congress never formally declared war, he used his authority as commander in chief to expand the powers of the presidency.