The conclusion is that although a US president can technically send troops into a foreign country, in order to lawfully declare war, he or she must get the approval of Congress.
As my history teacher always said it's always about the railroad XD So the answer to your question will be that the interstate commerce Act put regulations on the railroad.
One was that nobody could enforce the laws and they had to borrow money and couldn't repay it hope that helps<span />
Walt Whitman supported the Mexican-American War. He justified his support of the war with the concept of manifest destiny. This was the idea that the USA was destined to stretch from coast to coast on the North American continent. Dominated by Anglo-Saxons, the USA had a mission to spread civilization and institutions across the American continent. Whitman believed that it was America's duty to rid Mexico off its misery, inefficiency, her burlesque against freedom and superstition.
